25229540 has 24 divisors (see below), whose sum is σ = 60551232. Its totient is φ = 8650080.

The previous prime is 25229483. The next prime is 25229563. The reversal of 25229540 is 4592252.

It is a super-2 number, since 2×25229540² = 1273059377223200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89966 + ... + 90245.

It is an arithmetic number, because the mean of its divisors is an integer number (2522968).

Almost surely, 2^25229540 is an apocalyptic number.

25229540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25229540 is an abundant number, since it is smaller than the sum of its proper divisors (35321692).

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

25229540 is a wasteful number, since it uses less digits than its factorization.

25229540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180227 (or 180225 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 25229540 is about 5022.9015518921. The cubic root of 25229540 is about 293.2939541949.

It can be divided in two parts, 252 and 29540, that added together give a palindrome (29792).

The spelling of 25229540 in words is "twenty-five million, two hundred twenty-nine thousand, five hundred forty".