309936690 has 192 divisors, whose sum is σ = 999288576. Its totient is φ = 65028096.

The previous prime is 309936643. The next prime is 309936701. The reversal of 309936690 is 96639903.

309936690 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×309936690² = 192121503616312200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 460194 + ... + 460866.

It is an arithmetic number, because the mean of its divisors is an integer number (5204628).

Almost surely, 2^309936690 is an apocalyptic number.

309936690 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 309936690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (499644288).

309936690 is an abundant number, since it is smaller than the sum of its proper divisors (689351886).

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

309936690 is a wasteful number, since it uses less digits than its factorization.

309936690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753 (or 750 counting only the distinct ones).

The product of its (nonzero) digits is 236196, while the sum is 45.

The square root of 309936690 is about 17605.0188866698. The cubic root of 309936690 is about 676.7438694165.

The spelling of 309936690 in words is "three hundred nine million, nine hundred thirty-six thousand, six hundred ninety".