809390970 has 24 divisors (see below), whose sum is σ = 2104416756. Its totient is φ = 215837568.

The previous prime is 809390929. The next prime is 809390971. The reversal of 809390970 is 79093908.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 809345601 + 45369 = 28449^2 + 213^2 .

It is a super-2 number, since 2×809390970² = 1310227484635081800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (809390971) 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, 4496527 + ... + 4496706.

Almost surely, 2^809390970 is an apocalyptic number.

809390970 is an abundant number, since it is smaller than the sum of its proper divisors (1295025786).

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

809390970 is a wasteful number, since it uses less digits than its factorization.

809390970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8993246 (or 8993243 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 809390970 is about 28449.7973630745. The cubic root of 809390970 is about 931.9360638476.

The spelling of 809390970 in words is "eight hundred nine million, three hundred ninety thousand, nine hundred seventy".