309489225 has 12 divisors (see below), whose sum is σ = 511688976. Its totient is φ = 165060880.

The previous prime is 309489217. The next prime is 309489239. The reversal of 309489225 is 522984903.

It is not a de Polignac number, because 309489225 - 2³ = 309489217 is a prime.

It is a super-2 number, since 2×309489225² = 191567160782201250, which contains 22 as substring.

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, 2063187 + ... + 2063336.

It is an arithmetic number, because the mean of its divisors is an integer number (42640748).

Almost surely, 2^309489225 is an apocalyptic number.

It is an amenable number.

309489225 is a deficient number, since it is larger than the sum of its proper divisors (202199751).

309489225 is a wasteful number, since it uses less digits than its factorization.

309489225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4126536 (or 4126531 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 309489225 is about 17592.3058465910. The cubic root of 309489225 is about 676.4180340098.

The spelling of 309489225 in words is "three hundred nine million, four hundred eighty-nine thousand, two hundred twenty-five".