251342040 has 64 divisors (see below), whose sum is σ = 755308800. Its totient is φ = 66910592.

The previous prime is 251342027. The next prime is 251342053. The reversal of 251342040 is 40243152.

It is an interprime number because it is at equal distance from previous prime (251342027) and next prime (251342053).

It is a junction number, because it is equal to n+sod(n) for n = 251341998 and 251342016.

It is a congruent number.

It is an unprimeable number.

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, 87751 + ... + 90569.

It is an arithmetic number, because the mean of its divisors is an integer number (11801700).

Almost surely, 2^251342040 is an apocalyptic number.

251342040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251342040 is an abundant number, since it is smaller than the sum of its proper divisors (503966760).

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

251342040 is a wasteful number, since it uses less digits than its factorization.

251342040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3576 (or 3572 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 251342040 is about 15853.7705294356. The cubic root of 251342040 is about 631.0857568319.

Adding to 251342040 its reverse (40243152), we get a palindrome (291585192).

The spelling of 251342040 in words is "two hundred fifty-one million, three hundred forty-two thousand, forty".