25640938 has 8 divisors (see below), whose sum is σ = 38532132. Its totient is φ = 12796896.

The previous prime is 25640933. The next prime is 25640939. The reversal of 25640938 is 83904652.

It can be written as a sum of positive squares in 2 ways, for example, as 24334489 + 1306449 = 4933^2 + 1143^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 25640897 and 25640906.

It is not an unprimeable number, because it can be changed into a prime (25640933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10395 + ... + 12622.

Almost surely, 2^25640938 is an apocalyptic number.

25640938 is a deficient number, since it is larger than the sum of its proper divisors (12891194).

25640938 is a wasteful number, since it uses less digits than its factorization.

25640938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23576.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 25640938 is about 5063.6881815530. The cubic root of 25640938 is about 294.8795371416.

The spelling of 25640938 in words is "twenty-five million, six hundred forty thousand, nine hundred thirty-eight".