251425240 has 64 divisors (see below), whose sum is σ = 653456160. Its totient is φ = 86046720.

The previous prime is 251425219. The next prime is 251425247. The reversal of 251425240 is 42524152.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251425247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9327 + ... + 24286.

Almost surely, 2^251425240 is an apocalyptic number.

251425240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251425240 is an abundant number, since it is smaller than the sum of its proper divisors (402030920).

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

251425240 is a wasteful number, since it uses less digits than its factorization.

251425240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33652 (or 33648 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 251425240 is about 15856.3942937857. The cubic root of 251425240 is about 631.1553837865.

Adding to 251425240 its reverse (42524152), we get a palindrome (293949392).

The spelling of 251425240 in words is "two hundred fifty-one million, four hundred twenty-five thousand, two hundred forty".