309401900 has 54 divisors (see below), whose sum is σ = 685776420. Its totient is φ = 121131840.

The previous prime is 309401857. The next prime is 309401903. The reversal of 309401900 is 9104903.

It is a happy number.

It is a super-2 number, since 2×309401900² = 191459071447220000, 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 309401900.

It is not an unprimeable number, because it can be changed into a prime (309401903) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1350986 + ... + 1351214.

Almost surely, 2^309401900 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 309401900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (342888210).

309401900 is an abundant number, since it is smaller than the sum of its proper divisors (376374520).

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

309401900 is a wasteful number, since it uses less digits than its factorization.

309401900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531 (or 295 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 309401900 is about 17589.8237626191. The cubic root of 309401900 is about 676.3544090040.

The spelling of 309401900 in words is "three hundred nine million, four hundred one thousand, nine hundred".