816497400 has 48 divisors (see below), whose sum is σ = 2531143800. Its totient is φ = 217732480.

The previous prime is 816497399. The next prime is 816497441. The reversal of 816497400 is 4794618.

It is a happy number.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

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, 679815 + ... + 681014.

Almost surely, 2^816497400 is an apocalyptic number.

It is an amenable number.

816497400 is an abundant number, since it is smaller than the sum of its proper divisors (1714646400).

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

816497400 is a wasteful number, since it uses less digits than its factorization.

816497400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360848 (or 1360839 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 816497400 is about 28574.4186292565. The cubic root of 816497400 is about 934.6555777185.

The spelling of 816497400 in words is "eight hundred sixteen million, four hundred ninety-seven thousand, four hundred".