309428125 has 12 divisors (see below), whose sum is σ = 386764308. Its totient is φ = 247540000.

The previous prime is 309428117. The next prime is 309428149. The reversal of 309428125 is 521824903.

It can be written as a sum of positive squares in 6 ways, for example, as 308810329 + 617796 = 17573^2 + 786^2 .

It is not a de Polignac number, because 309428125 - 2³ = 309428117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46384 + ... + 52633.

It is an arithmetic number, because the mean of its divisors is an integer number (32230359).

Almost surely, 2^309428125 is an apocalyptic number.

It is an amenable number.

309428125 is a deficient number, since it is larger than the sum of its proper divisors (77336183).

309428125 is an frugal number, since it uses more digits than its factorization.

309428125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99042 (or 99022 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 309428125 is about 17590.5692062537. The cubic root of 309428125 is about 676.3735177999.

The spelling of 309428125 in words is "three hundred nine million, four hundred twenty-eight thousand, one hundred twenty-five".