318215840 has 48 divisors (see below), whose sum is σ = 777719880. Its totient is φ = 122895360.

The previous prime is 318215813. The next prime is 318215861. The reversal of 318215840 is 48512813.

It can be written as a sum of positive squares in 4 ways, for example, as 217975696 + 100240144 = 14764^2 + 10012^2 .

It is a super-2 number, since 2×318215840² = 202522641653811200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 318215797 and 318215806.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29651 + ... + 38930.

Almost surely, 2^318215840 is an apocalyptic number.

It is an amenable number.

318215840 is an abundant number, since it is smaller than the sum of its proper divisors (459504040).

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

318215840 is a wasteful number, since it uses less digits than its factorization.

318215840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68625 (or 68617 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 318215840 is about 17838.6053266504. The cubic root of 318215840 is about 682.7168126887.

The spelling of 318215840 in words is "three hundred eighteen million, two hundred fifteen thousand, eight hundred forty".