309977272 has 48 divisors (see below), whose sum is σ = 643821480. Its totient is φ = 138758400.

The previous prime is 309977257. The next prime is 309977273. The reversal of 309977272 is 272779903.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309977273) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 468622 + ... + 469282.

Almost surely, 2^309977272 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 309977272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (321910740).

309977272 is an abundant number, since it is smaller than the sum of its proper divisors (333844208).

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

309977272 is a wasteful number, since it uses less digits than its factorization.

309977272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824 (or 747 counting only the distinct ones).

The product of its (nonzero) digits is 333396, while the sum is 46.

The square root of 309977272 is about 17606.1714180000. The cubic root of 309977272 is about 676.7734049335.

It can be divided in two parts, 309977 and 272, that added together give a square (310249 = 557²).

The spelling of 309977272 in words is "three hundred nine million, nine hundred seventy-seven thousand, two hundred seventy-two".