315408721 has 8 divisors (see below), whose sum is σ = 332300000. Its totient is φ = 298546560.

The previous prime is 315408719. The next prime is 315408739. The reversal of 315408721 is 127804513.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 315408721 - 2¹ = 315408719 is a prime.

It is a super-2 number, since 2×315408721² = 198965322565711682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (315408781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17086 + ... + 30376.

It is an arithmetic number, because the mean of its divisors is an integer number (41537500).

Almost surely, 2^315408721 is an apocalyptic number.

It is an amenable number.

315408721 is a deficient number, since it is larger than the sum of its proper divisors (16891279).

315408721 is a wasteful number, since it uses less digits than its factorization.

315408721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14559.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 315408721 is about 17759.7500263940. The cubic root of 315408721 is about 680.7033675110.

The spelling of 315408721 in words is "three hundred fifteen million, four hundred eight thousand, seven hundred twenty-one".