309949321 has 12 divisors (see below), whose sum is σ = 359190000. Its totient is φ = 265194560.

The previous prime is 309949319. The next prime is 309949363. The reversal of 309949321 is 123949903.

It is not a de Polignac number, because 309949321 - 2¹ = 309949319 is a prime.

It is a super-2 number, since 2×309949321² = 192137163176722082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (309949391) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45571 + ... + 51928.

It is an arithmetic number, because the mean of its divisors is an integer number (29932500).

Almost surely, 2^309949321 is an apocalyptic number.

It is an amenable number.

309949321 is a deficient number, since it is larger than the sum of its proper divisors (49240679).

309949321 is a wasteful number, since it uses less digits than its factorization.

309949321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97544 (or 97527 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 40.

The square root of 309949321 is about 17605.3776159445. The cubic root of 309949321 is about 676.7530625151.

The spelling of 309949321 in words is "three hundred nine million, nine hundred forty-nine thousand, three hundred twenty-one".