25809474 has 16 divisors (see below), whose sum is σ = 51814080. Its totient is φ = 8570640.

The previous prime is 25809457. The next prime is 25809479. The reversal of 25809474 is 47490852.

It is a super-2 number, since 2×25809474² = 1332257896313352, which contains 22 as substring.

It is a cake number, because a cake can be divided into 25809474 parts by 537 planar cuts.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25809479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6382 + ... + 9609.

It is an arithmetic number, because the mean of its divisors is an integer number (3238380).

Almost surely, 2^25809474 is an apocalyptic number.

25809474 is an abundant number, since it is smaller than the sum of its proper divisors (26004606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25809474 is a wasteful number, since it uses less digits than its factorization.

25809474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16265.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 25809474 is about 5080.3025500456. The cubic root of 25809474 is about 295.5242005941.

The spelling of 25809474 in words is "twenty-five million, eight hundred nine thousand, four hundred seventy-four".