25402040 has 16 divisors (see below), whose sum is σ = 57154680. Its totient is φ = 10160800.

The previous prime is 25402033. The next prime is 25402073. The reversal of 25402040 is 4020452.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 317486 + ... + 317565.

Almost surely, 2^25402040 is an apocalyptic number.

25402040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25402040 is an abundant number, since it is smaller than the sum of its proper divisors (31752640).

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

25402040 is a wasteful number, since it uses less digits than its factorization.

25402040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635062 (or 635058 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 25402040 is about 5040.0436506046. The cubic root of 25402040 is about 293.9608752909.

Adding to 25402040 its reverse (4020452), we get a palindrome (29422492).

The spelling of 25402040 in words is "twenty-five million, four hundred two thousand, forty".