812072309 has 8 divisors (see below), whose sum is σ = 815328000. Its totient is φ = 808823232.

The previous prime is 812072257. The next prime is 812072323. The reversal of 812072309 is 903270218.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 812072309 - 2²⁸ = 543636853 is a prime.

It is a super-2 number, since 2×812072309² = 1318922870089182962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812072399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 544637 + ... + 546125.

It is an arithmetic number, because the mean of its divisors is an integer number (101916000).

Almost surely, 2^812072309 is an apocalyptic number.

It is an amenable number.

812072309 is a deficient number, since it is larger than the sum of its proper divisors (3255691).

812072309 is a wasteful number, since it uses less digits than its factorization.

812072309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3307.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 812072309 is about 28496.8824435235. The cubic root of 812072309 is about 932.9640310901.

The spelling of 812072309 in words is "eight hundred twelve million, seventy-two thousand, three hundred nine".