25705917 has 20 divisors (see below), whose sum is σ = 40423680. Its totient is φ = 16234344.

The previous prime is 25705903. The next prime is 25705931. The reversal of 25705917 is 71950752.

It is an interprime number because it is at equal distance from previous prime (25705903) and next prime (25705931).

It is not a de Polignac number, because 25705917 - 2¹¹ = 25703869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25705987) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6813 + ... + 9890.

It is an arithmetic number, because the mean of its divisors is an integer number (2021184).

Almost surely, 2^25705917 is an apocalyptic number.

25705917 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

25705917 is a deficient number, since it is larger than the sum of its proper divisors (14717763).

25705917 is a wasteful number, since it uses less digits than its factorization.

25705917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16734 (or 16725 counting only the distinct ones).

The product of its (nonzero) digits is 22050, while the sum is 36.

The square root of 25705917 is about 5070.1002948660. The cubic root of 25705917 is about 295.1284205788.

The spelling of 25705917 in words is "twenty-five million, seven hundred five thousand, nine hundred seventeen".