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139481 = 1011381
BaseRepresentation
bin100010000011011001
321002022222
4202003121
513430411
62553425
71120436
oct420331
9232288
10139481
1195881
1268875
134b644
1438b8d
152b4db
hex220d9

139481 has 4 divisors (see below), whose sum is σ = 140964. Its totient is φ = 138000.

The previous prime is 139459. The next prime is 139483. The reversal of 139481 is 184931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 184931 = 1011831.

It can be written as a sum of positive squares in 2 ways, for example, as 105625 + 33856 = 325^2 + 184^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-139481 is a prime.

It is a super-2 number, since 2×1394812 = 38909898722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 139481.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 139481.

It is not an unprimeable number, because it can be changed into a prime (139483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 590 + ... + 791.

It is an arithmetic number, because the mean of its divisors is an integer number (35241).

2139481 is an apocalyptic number.

It is an amenable number.

139481 is a deficient number, since it is larger than the sum of its proper divisors (1483).

139481 is a wasteful number, since it uses less digits than its factorization.

139481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1482.

The product of its digits is 864, while the sum is 26.

The square root of 139481 is about 373.4715517948. The cubic root of 139481 is about 51.8606971746.

The spelling of 139481 in words is "one hundred thirty-nine thousand, four hundred eighty-one".

Divisors: 1 101 1381 139481