139477 has 4 divisors (see below), whose sum is σ = 150220. Its totient is φ = 128736.

The previous prime is 139459. The next prime is 139483. The reversal of 139477 is 774931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60516 + 78961 = 246^2 + 281^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139457) 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, 5352 + ... + 5377.

It is an arithmetic number, because the mean of its divisors is an integer number (37555).

2¹³⁹⁴⁷⁷ is an apocalyptic number.

It is an amenable number.

139477 is a deficient number, since it is larger than the sum of its proper divisors (10743).

139477 is a wasteful number, since it uses less digits than its factorization.

139477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10742.

The product of its digits is 5292, while the sum is 31.

The square root of 139477 is about 373.4661965962. The cubic root of 139477 is about 51.8602014206.

It can be divided in two parts, 139 and 477, that added together give a palindrome (616).

The spelling of 139477 in words is "one hundred thirty-nine thousand, four hundred seventy-seven".