816439900 has 36 divisors (see below), whose sum is σ = 1832773320. Its totient is φ = 315313600.

The previous prime is 816439889. The next prime is 816439919. The reversal of 816439900 is 9934618.

It is a super-2 number, since 2×816439900² = 1333148220624020000, 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 11 ways as a sum of consecutive naturals, for example, 137866 + ... + 143665.

It is an arithmetic number, because the mean of its divisors is an integer number (50910370).

Almost surely, 2^816439900 is an apocalyptic number.

It is an amenable number.

816439900 is an abundant number, since it is smaller than the sum of its proper divisors (1016333420).

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

816439900 is a wasteful number, since it uses less digits than its factorization.

816439900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281574 (or 281567 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 816439900 is about 28573.4124668371. The cubic root of 816439900 is about 934.6336368618.

The spelling of 816439900 in words is "eight hundred sixteen million, four hundred thirty-nine thousand, nine hundred".