309991196 has 24 divisors (see below), whose sum is σ = 562929024. Its totient is φ = 149207040.

The previous prime is 309991189. The next prime is 309991211. The reversal of 309991196 is 691199903.

It is a self number, because there is not a number n which added to its sum of digits gives 309991196.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17456 + ... + 30408.

It is an arithmetic number, because the mean of its divisors is an integer number (23455376).

Almost surely, 2^309991196 is an apocalyptic number.

It is an amenable number.

309991196 is a deficient number, since it is larger than the sum of its proper divisors (252937828).

309991196 is a wasteful number, since it uses less digits than its factorization.

309991196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13181 (or 13179 counting only the distinct ones).

The product of its (nonzero) digits is 118098, while the sum is 47.

The square root of 309991196 is about 17606.5668430844. The cubic root of 309991196 is about 676.7835382052.

The spelling of 309991196 in words is "three hundred nine million, nine hundred ninety-one thousand, one hundred ninety-six".