309949907 has 12 divisors (see below), whose sum is σ = 327848976. Its totient is φ = 292984560.

The previous prime is 309949903. The next prime is 309949921. The reversal of 309949907 is 709949903.

It is not a de Polignac number, because 309949907 - 2² = 309949903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (309949901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 261857 + ... + 263037.

It is an arithmetic number, because the mean of its divisors is an integer number (27320748).

Almost surely, 2^309949907 is an apocalyptic number.

309949907 is a deficient number, since it is larger than the sum of its proper divisors (17899069).

309949907 is a wasteful number, since it uses less digits than its factorization.

309949907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1946 (or 1927 counting only the distinct ones).

The product of its (nonzero) digits is 551124, while the sum is 50.

The square root of 309949907 is about 17605.3942585788. The cubic root of 309949907 is about 676.7534890118.

The spelling of 309949907 in words is "three hundred nine million, nine hundred forty-nine thousand, nine hundred seven".