252451220 has 48 divisors (see below), whose sum is σ = 632233728. Its totient is φ = 82790400.

The previous prime is 252451219. The next prime is 252451229. The reversal of 252451220 is 22154252.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252451229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35981 + ... + 42420.

It is an arithmetic number, because the mean of its divisors is an integer number (13171536).

Almost surely, 2^252451220 is an apocalyptic number.

252451220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

252451220 is an abundant number, since it is smaller than the sum of its proper divisors (379782508).

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

252451220 is a wasteful number, since it uses less digits than its factorization.

252451220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78440 (or 78438 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 252451220 is about 15888.7136043167. The cubic root of 252451220 is about 632.0127280725.

The spelling of 252451220 in words is "two hundred fifty-two million, four hundred fifty-one thousand, two hundred twenty".