25231140 has 72 divisors (see below), whose sum is σ = 83498688. Its totient is φ = 6116160.

The previous prime is 25231121. The next prime is 25231147. The reversal of 25231140 is 4113252.

25231140 is a `hidden beast` number, since 2 + 523 + 1 + 140 = 666.

It is a super-2 number, since 2×25231140² = 1273220851399200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (25231147) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4392 + ... + 8351.

It is an arithmetic number, because the mean of its divisors is an integer number (1159704).

Almost surely, 2^25231140 is an apocalyptic number.

25231140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25231140 is an abundant number, since it is smaller than the sum of its proper divisors (58267548).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25231140 is a wasteful number, since it uses less digits than its factorization.

25231140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12769 (or 12764 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 25231140 is about 5023.0608198587. The cubic root of 25231140 is about 293.3001540755.

Adding to 25231140 its reverse (4113252), we get a palindrome (29344392).

It can be divided in two parts, 2523 and 1140, that added together give a palindrome (3663).

The spelling of 25231140 in words is "twenty-five million, two hundred thirty-one thousand, one hundred forty".