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139087 = 132823
BaseRepresentation
bin100001111101001111
321001210101
4201331033
513422322
62551531
71116334
oct417517
9231711
10139087
1195553
12685a7
134b400
143898b
152b327
hex21f4f

139087 has 6 divisors (see below), whose sum is σ = 150792. Its totient is φ = 128232.

The previous prime is 139079. The next prime is 139091. The reversal of 139087 is 780931.

It is not a de Polignac number, because 139087 - 23 = 139079 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 243 + ... + 580.

It is an arithmetic number, because the mean of its divisors is an integer number (25132).

2139087 is an apocalyptic number.

139087 is a deficient number, since it is larger than the sum of its proper divisors (11705).

139087 is an equidigital number, since it uses as much as digits as its factorization.

139087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849 (or 836 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 139087 is about 372.9436954823. The cubic root of 139087 is about 51.8118198257.

The spelling of 139087 in words is "one hundred thirty-nine thousand, eighty-seven".

Divisors: 1 13 169 823 10699 139087