251202240 has 84 divisors (see below), whose sum is σ = 864040944. Its totient is φ = 66986496.

The previous prime is 251202227. The next prime is 251202257. The reversal of 251202240 is 42202152.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40732 + ... + 46491.

Almost surely, 2^251202240 is an apocalyptic number.

251202240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

251202240 is an abundant number, since it is smaller than the sum of its proper divisors (612838704).

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

251202240 is a wasteful number, since it uses less digits than its factorization.

251202240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87246 (or 87233 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 251202240 is about 15849.3608703947. The cubic root of 251202240 is about 630.9687288550.

Adding to 251202240 its reverse (42202152), we get a palindrome (293404392).

The spelling of 251202240 in words is "two hundred fifty-one million, two hundred two thousand, two hundred forty".