25400091 has 16 divisors (see below), whose sum is σ = 36539424. Its totient is φ = 15634944.

The previous prime is 25400083. The next prime is 25400147. The reversal of 25400091 is 19000452.

It is not a de Polignac number, because 25400091 - 2³ = 25400083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25400021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1996 + ... + 7401.

It is an arithmetic number, because the mean of its divisors is an integer number (2283714).

Almost surely, 2^25400091 is an apocalyptic number.

25400091 is a deficient number, since it is larger than the sum of its proper divisors (11139333).

25400091 is a wasteful number, since it uses less digits than its factorization.

25400091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9470.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 25400091 is about 5039.8502953957. The cubic root of 25400091 is about 293.9533569394.

The spelling of 25400091 in words is "twenty-five million, four hundred thousand, ninety-one".