815138322 has 16 divisors (see below), whose sum is σ = 1686493440. Its totient is φ = 262343312.

The previous prime is 815138309. The next prime is 815138327. The reversal of 815138322 is 223831518.

It is not an unprimeable number, because it can be changed into a prime (815138327) 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, 2342178 + ... + 2342525.

It is an arithmetic number, because the mean of its divisors is an integer number (105405840).

Almost surely, 2^815138322 is an apocalyptic number.

815138322 is an abundant number, since it is smaller than the sum of its proper divisors (871355118).

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

815138322 is a wasteful number, since it uses less digits than its factorization.

815138322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4684737.

The product of its digits is 11520, while the sum is 33.

The square root of 815138322 is about 28550.6273486241. The cubic root of 815138322 is about 934.1367047525.

The spelling of 815138322 in words is "eight hundred fifteen million, one hundred thirty-eight thousand, three hundred twenty-two".