25901985 has 16 divisors (see below), whose sum is σ = 41537664. Its totient is φ = 13782912.

The previous prime is 25901983. The next prime is 25901987. The reversal of 25901985 is 58910952.

It is an interprime number because it is at equal distance from previous prime (25901983) and next prime (25901987).

It is not a de Polignac number, because 25901985 - 2¹ = 25901983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25901983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5829 + ... + 9261.

It is an arithmetic number, because the mean of its divisors is an integer number (2596104).

Almost surely, 2^25901985 is an apocalyptic number.

It is an amenable number.

25901985 is a deficient number, since it is larger than the sum of its proper divisors (15635679).

25901985 is a wasteful number, since it uses less digits than its factorization.

25901985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3944.

The product of its (nonzero) digits is 32400, while the sum is 39.

The square root of 25901985 is about 5089.3992769285. The cubic root of 25901985 is about 295.8768700500.

The spelling of 25901985 in words is "twenty-five million, nine hundred one thousand, nine hundred eighty-five".