309993906 has 16 divisors (see below), whose sum is σ = 630496800. Its totient is φ = 101579808.

The previous prime is 309993899. The next prime is 309993941. The reversal of 309993906 is 609399903.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 437491 + ... + 438198.

It is an arithmetic number, because the mean of its divisors is an integer number (39406050).

Almost surely, 2^309993906 is an apocalyptic number.

309993906 is an abundant number, since it is smaller than the sum of its proper divisors (320502894).

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

309993906 is a wasteful number, since it uses less digits than its factorization.

309993906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875753.

The product of its (nonzero) digits is 354294, while the sum is 48.

The square root of 309993906 is about 17606.6438028376. The cubic root of 309993906 is about 676.7855103882.

The spelling of 309993906 in words is "three hundred nine million, nine hundred ninety-three thousand, nine hundred six".