815941818 has 24 divisors (see below), whose sum is σ = 1768673556. Its totient is φ = 271857600.

The previous prime is 815941817. The next prime is 815941823. The reversal of 815941818 is 818149518.

It can be written as a sum of positive squares in 2 ways, for example, as 815502249 + 439569 = 28557^2 + 663^2 .

It is a super-2 number, since 2×815941818² = 1331522100722290248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (815941817) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36388 + ... + 54368.

Almost surely, 2^815941818 is an apocalyptic number.

815941818 is an abundant number, since it is smaller than the sum of its proper divisors (952731738).

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

815941818 is a wasteful number, since it uses less digits than its factorization.

815941818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20510 (or 20507 counting only the distinct ones).

The product of its digits is 92160, while the sum is 45.

The square root of 815941818 is about 28564.6953073195. The cubic root of 815941818 is about 934.4435355492.

The spelling of 815941818 in words is "eight hundred fifteen million, nine hundred forty-one thousand, eight hundred eighteen".