309540930 has 32 divisors (see below), whose sum is σ = 786599424. Its totient is φ = 77688576.

The previous prime is 309540911. The next prime is 309540953. The reversal of 309540930 is 39045903.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 309540891 and 309540900.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 302962 + ... + 303981.

It is an arithmetic number, because the mean of its divisors is an integer number (24581232).

Almost surely, 2^309540930 is an apocalyptic number.

309540930 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

309540930 is an abundant number, since it is smaller than the sum of its proper divisors (477058494).

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

309540930 is a wasteful number, since it uses less digits than its factorization.

309540930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606970.

The product of its (nonzero) digits is 14580, while the sum is 33.

The square root of 309540930 is about 17593.7753196976. The cubic root of 309540930 is about 676.4557006383.

The spelling of 309540930 in words is "three hundred nine million, five hundred forty thousand, nine hundred thirty".