813387309 has 24 divisors (see below), whose sum is σ = 1262937600. Its totient is φ = 464292864.

The previous prime is 813387307. The next prime is 813387313. The reversal of 813387309 is 903783318.

It is not a de Polignac number, because 813387309 - 2¹ = 813387307 is a prime.

It is a super-2 number, since 2×813387309² = 1323197828884522962, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813387307) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 167092 + ... + 171890.

It is an arithmetic number, because the mean of its divisors is an integer number (52622400).

Almost surely, 2^813387309 is an apocalyptic number.

It is an amenable number.

813387309 is a deficient number, since it is larger than the sum of its proper divisors (449550291).

813387309 is a wasteful number, since it uses less digits than its factorization.

813387309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5969 (or 5962 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 813387309 is about 28519.9458099064. The cubic root of 813387309 is about 933.4673467289.

The spelling of 813387309 in words is "eight hundred thirteen million, three hundred eighty-seven thousand, three hundred nine".