25640923 has 32 divisors (see below), whose sum is σ = 33426432. Its totient is φ = 19094400.

The previous prime is 25640921. The next prime is 25640933. The reversal of 25640923 is 32904652.

It is a cyclic number.

It is not a de Polignac number, because 25640923 - 2¹ = 25640921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25640921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 248890 + ... + 248992.

It is an arithmetic number, because the mean of its divisors is an integer number (1044576).

Almost surely, 2^25640923 is an apocalyptic number.

25640923 is a deficient number, since it is larger than the sum of its proper divisors (7785509).

25640923 is a wasteful number, since it uses less digits than its factorization.

25640923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 25640923 is about 5063.6867004190. The cubic root of 25640923 is about 294.8794796399.

The spelling of 25640923 in words is "twenty-five million, six hundred forty thousand, nine hundred twenty-three".