309997338 has 16 divisors (see below), whose sum is σ = 708565440. Its totient is φ = 88570656.

The previous prime is 309997319. The next prime is 309997339. The reversal of 309997338 is 833799903.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (309997339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3690403 + ... + 3690486.

It is an arithmetic number, because the mean of its divisors is an integer number (44285340).

Almost surely, 2^309997338 is an apocalyptic number.

309997338 is an abundant number, since it is smaller than the sum of its proper divisors (398568102).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

309997338 is a wasteful number, since it uses less digits than its factorization.

309997338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7380901.

The product of its (nonzero) digits is 1102248, while the sum is 51.

The square root of 309997338 is about 17606.7412657766. The cubic root of 309997338 is about 676.7880079849.

The spelling of 309997338 in words is "three hundred nine million, nine hundred ninety-seven thousand, three hundred thirty-eight".