25404381 has 8 divisors (see below), whose sum is σ = 37636160. Its totient is φ = 16936236.

The previous prime is 25404373. The next prime is 25404413. The reversal of 25404381 is 18340452.

25404381 is a `hidden beast` number, since 2 + 540 + 43 + 81 = 666.

It is not a de Polignac number, because 25404381 - 2³ = 25404373 is a prime.

It is a super-2 number, since 2×25404381² = 1290765147986322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 940903 = 25404381 / (2 + 5 + 4 + 0 + 4 + 3 + 8 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25404371) 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, 470425 + ... + 470478.

It is an arithmetic number, because the mean of its divisors is an integer number (4704520).

Almost surely, 2^25404381 is an apocalyptic number.

It is an amenable number.

25404381 is a deficient number, since it is larger than the sum of its proper divisors (12231779).

25404381 is an equidigital number, since it uses as much as digits as its factorization.

25404381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940912 (or 940906 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 25404381 is about 5040.2758853063. The cubic root of 25404381 is about 293.9699052910.

The spelling of 25404381 in words is "twenty-five million, four hundred four thousand, three hundred eighty-one".