309929472 has 120 divisors (see below), whose sum is σ = 904544784. Its totient is φ = 102150144.

The previous prime is 309929447. The next prime is 309929479. The reversal of 309929472 is 274929903.

It is a super-2 number, since 2×309929472² = 192112555228397568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309929479) 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, 474298 + ... + 474950.

Almost surely, 2^309929472 is an apocalyptic number.

309929472 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 309929472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (452272392).

309929472 is an abundant number, since it is smaller than the sum of its proper divisors (594615312).

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

309929472 is a wasteful number, since it uses less digits than its factorization.

309929472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780 (or 761 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 309929472 is about 17604.8138871162. The cubic root of 309929472 is about 676.7386158972.

The spelling of 309929472 in words is "three hundred nine million, nine hundred twenty-nine thousand, four hundred seventy-two".