309869472 has 192 divisors, whose sum is σ = 964752768. Its totient is φ = 86016000.

The previous prime is 309869471. The next prime is 309869479. The reversal of 309869472 is 274968903.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (309869471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 735822 + ... + 736242.

It is an arithmetic number, because the mean of its divisors is an integer number (5024754).

Almost surely, 2^309869472 is an apocalyptic number.

309869472 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 309869472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (482376384).

309869472 is an abundant number, since it is smaller than the sum of its proper divisors (654883296).

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

309869472 is a wasteful number, since it uses less digits than its factorization.

309869472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503 (or 495 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 48.

The square root of 309869472 is about 17603.1097252730. The cubic root of 309869472 is about 676.6949425874.

The spelling of 309869472 in words is "three hundred nine million, eight hundred sixty-nine thousand, four hundred seventy-two".