309917130 has 32 divisors (see below), whose sum is σ = 754282368. Its totient is φ = 81480000.

The previous prime is 309917119. The next prime is 309917131. The reversal of 309917130 is 31719903.

It is a junction number, because it is equal to n+sod(n) for n = 309917091 and 309917100.

It is not an unprimeable number, because it can be changed into a prime (309917131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70621 + ... + 74880.

It is an arithmetic number, because the mean of its divisors is an integer number (23571324).

Almost surely, 2^309917130 is an apocalyptic number.

309917130 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

309917130 is an abundant number, since it is smaller than the sum of its proper divisors (444365238).

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

309917130 is a wasteful number, since it uses less digits than its factorization.

309917130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145582.

The product of its (nonzero) digits is 5103, while the sum is 33.

The square root of 309917130 is about 17604.4633545019. The cubic root of 309917130 is about 676.7296327579.

The spelling of 309917130 in words is "three hundred nine million, nine hundred seventeen thousand, one hundred thirty".