25402981 has 32 divisors (see below), whose sum is σ = 30412800. Its totient is φ = 21047040.

The previous prime is 25402973. The next prime is 25402997. The reversal of 25402981 is 18920452.

It is a cyclic number.

It is not a de Polignac number, because 25402981 - 2³ = 25402973 is a prime.

It is a super-2 number, since 2×25402981² = 1290622887372722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25403981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 430530 + ... + 430588.

It is an arithmetic number, because the mean of its divisors is an integer number (950400).

Almost surely, 2^25402981 is an apocalyptic number.

It is an amenable number.

25402981 is a deficient number, since it is larger than the sum of its proper divisors (5009819).

25402981 is a wasteful number, since it uses less digits than its factorization.

25402981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 25402981 is about 5040.1370021062. The cubic root of 25402981 is about 293.9645051014.

The spelling of 25402981 in words is "twenty-five million, four hundred two thousand, nine hundred eighty-one".