811437990 has 32 divisors (see below), whose sum is σ = 2124493056. Its totient is φ = 196712160.

The previous prime is 811437919. The next prime is 811438027. The reversal of 811437990 is 99734118.

It is a happy number.

It is a super-2 number, since 2×811437990² = 1316863223230480200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1229122 + ... + 1229781.

It is an arithmetic number, because the mean of its divisors is an integer number (66390408).

Almost surely, 2^811437990 is an apocalyptic number.

811437990 is an abundant number, since it is smaller than the sum of its proper divisors (1313055066).

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

811437990 is a wasteful number, since it uses less digits than its factorization.

811437990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2458924.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 811437990 is about 28485.7506483505. The cubic root of 811437990 is about 932.7210515106.

The spelling of 811437990 in words is "eight hundred eleven million, four hundred thirty-seven thousand, nine hundred ninety".