25670139 has 32 divisors (see below), whose sum is σ = 40255488. Its totient is φ = 14388000.

The previous prime is 25670137. The next prime is 25670143. The reversal of 25670139 is 93107652.

25670139 = 257² + 258² + ... + 454².

It is not a de Polignac number, because 25670139 - 2¹ = 25670137 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (25670137) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22984 + ... + 24074.

It is an arithmetic number, because the mean of its divisors is an integer number (1257984).

Almost surely, 2^25670139 is an apocalyptic number.

25670139 is a deficient number, since it is larger than the sum of its proper divisors (14585349).

25670139 is a wasteful number, since it uses less digits than its factorization.

25670139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1159.

The product of its (nonzero) digits is 11340, while the sum is 33.

The square root of 25670139 is about 5066.5707337409. The cubic root of 25670139 is about 294.9914351626.

The spelling of 25670139 in words is "twenty-five million, six hundred seventy thousand, one hundred thirty-nine".