905139 has 12 divisors (see below), whose sum is σ = 1317576. Its totient is φ = 598752.

The previous prime is 905137. The next prime is 905143. The reversal of 905139 is 931509.

It is not a de Polignac number, because 905139 - 2¹ = 905137 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 905139.

It is not an unprimeable number, because it can be changed into a prime (905137) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1159 + ... + 1775.

It is an arithmetic number, because the mean of its divisors is an integer number (109798).

2⁹⁰⁵¹³⁹ is an apocalyptic number.

905139 is a deficient number, since it is larger than the sum of its proper divisors (412437).

905139 is a wasteful number, since it uses less digits than its factorization.

905139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786 (or 783 counting only the distinct ones).

The product of its (nonzero) digits is 1215, while the sum is 27.

The square root of 905139 is about 951.3879334951. The cubic root of 905139 is about 96.7323546131.

The spelling of 905139 in words is "nine hundred five thousand, one hundred thirty-nine".