252721392 has 160 divisors (see below), whose sum is σ = 823233024. Its totient is φ = 64896000.

The previous prime is 252721351. The next prime is 252721409. The reversal of 252721392 is 293127252.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 372958 + ... + 373634.

Almost surely, 2^252721392 is an apocalyptic number.

252721392 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 252721392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (411616512).

252721392 is an abundant number, since it is smaller than the sum of its proper divisors (570511632).

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

252721392 is a wasteful number, since it uses less digits than its factorization.

252721392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807 (or 801 counting only the distinct ones).

The product of its digits is 15120, while the sum is 33.

The square root of 252721392 is about 15897.2133407085. The cubic root of 252721392 is about 632.2381066179.

The spelling of 252721392 in words is "two hundred fifty-two million, seven hundred twenty-one thousand, three hundred ninety-two".