309997412 has 12 divisors (see below), whose sum is σ = 542986416. Its totient is φ = 154858440.

The previous prime is 309997411. The next prime is 309997423. The reversal of 309997412 is 214799903.

It is not an unprimeable number, because it can be changed into a prime (309997411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30014 + ... + 38997.

It is an arithmetic number, because the mean of its divisors is an integer number (45248868).

Almost surely, 2^309997412 is an apocalyptic number.

It is an amenable number.

309997412 is a deficient number, since it is larger than the sum of its proper divisors (232989004).

309997412 is a wasteful number, since it uses less digits than its factorization.

309997412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70138 (or 70136 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 309997412 is about 17606.7433672443. The cubic root of 309997412 is about 676.7880618373.

The spelling of 309997412 in words is "three hundred nine million, nine hundred ninety-seven thousand, four hundred twelve".