809812372 has 6 divisors (see below), whose sum is σ = 1417171658. Its totient is φ = 404906184.

The previous prime is 809812369. The next prime is 809812379. The reversal of 809812372 is 273218908.

It can be written as a sum of positive squares in only one way, i.e., 762532996 + 47279376 = 27614^2 + 6876^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809812379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101226543 + ... + 101226550.

Almost surely, 2^809812372 is an apocalyptic number.

It is an amenable number.

809812372 is a deficient number, since it is larger than the sum of its proper divisors (607359286).

809812372 is a wasteful number, since it uses less digits than its factorization.

809812372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202453097 (or 202453095 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 809812372 is about 28457.2024626456. The cubic root of 809812372 is about 932.0977704476.

The spelling of 809812372 in words is "eight hundred nine million, eight hundred twelve thousand, three hundred seventy-two".