309990105 has 32 divisors (see below), whose sum is σ = 560142720. Its totient is φ = 162613440.

The previous prime is 309990103. The next prime is 309990133. The reversal of 309990105 is 501099903.

It is not a de Polignac number, because 309990105 - 2¹ = 309990103 is a prime.

It is a super-2 number, since 2×309990105² = 192187730395822050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 309990105.

It is not an unprimeable number, because it can be changed into a prime (309990101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10587 + ... + 27056.

It is an arithmetic number, because the mean of its divisors is an integer number (17504460).

Almost surely, 2^309990105 is an apocalyptic number.

It is an amenable number.

309990105 is a deficient number, since it is larger than the sum of its proper divisors (250152615).

309990105 is a wasteful number, since it uses less digits than its factorization.

309990105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37718 (or 37712 counting only the distinct ones).

The product of its (nonzero) digits is 10935, while the sum is 36.

The square root of 309990105 is about 17606.5358602992. The cubic root of 309990105 is about 676.7827442346.

The spelling of 309990105 in words is "three hundred nine million, nine hundred ninety thousand, one hundred five".