309952136 has 64 divisors (see below), whose sum is σ = 652001280. Its totient is φ = 137168640.

The previous prime is 309952099. The next prime is 309952147. The reversal of 309952136 is 631259903.

309952136 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 2×309952136² = 192140653221924992, 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 309952136.

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, 409070 + ... + 409826.

It is an arithmetic number, because the mean of its divisors is an integer number (10187520).

Almost surely, 2^309952136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 309952136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (326000640).

309952136 is an abundant number, since it is smaller than the sum of its proper divisors (342049144).

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

309952136 is a wasteful number, since it uses less digits than its factorization.

309952136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934 (or 930 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 38.

The square root of 309952136 is about 17605.4575629263. The cubic root of 309952136 is about 676.7551112953.

The spelling of 309952136 in words is "three hundred nine million, nine hundred fifty-two thousand, one hundred thirty-six".