25540906 has 4 divisors (see below), whose sum is σ = 38311362. Its totient is φ = 12770452.

The previous prime is 25540897. The next prime is 25540913. The reversal of 25540906 is 60904552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16329681 + 9211225 = 4041^2 + 3035^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6385225 + ... + 6385228.

Almost surely, 2^25540906 is an apocalyptic number.

25540906 is a deficient number, since it is larger than the sum of its proper divisors (12770456).

25540906 is a wasteful number, since it uses less digits than its factorization.

25540906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12770455.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 25540906 is about 5053.8011436937. The cubic root of 25540906 is about 294.4955700103.

The spelling of 25540906 in words is "twenty-five million, five hundred forty thousand, nine hundred six".