812913040 has 20 divisors (see below), whose sum is σ = 1890023004. Its totient is φ = 325165184.

The previous prime is 812913037. The next prime is 812913041. The reversal of 812913040 is 40319218.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 392990976 + 419922064 = 19824^2 + 20492^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×812913040² = 1321655221204083200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (812913041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5080627 + ... + 5080786.

Almost surely, 2^812913040 is an apocalyptic number.

812913040 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

812913040 is an abundant number, since it is smaller than the sum of its proper divisors (1077109964).

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

812913040 is a wasteful number, since it uses less digits than its factorization.

812913040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10161426 (or 10161420 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 812913040 is about 28511.6299078113. The cubic root of 812913040 is about 933.2858830752.

The spelling of 812913040 in words is "eight hundred twelve million, nine hundred thirteen thousand, forty".