320398825 has 18 divisors (see below), whose sum is σ = 403700414. Its totient is φ = 252204480.

The previous prime is 320398817. The next prime is 320398861. The reversal of 320398825 is 528893023.

It can be written as a sum of positive squares in 3 ways, for example, as 25280784 + 295118041 = 5028^2 + 17179^2 .

It is not a de Polignac number, because 320398825 - 2³ = 320398817 is a prime.

It is a super-2 number, since 2×320398825² = 205310814122761250, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 764466 + ... + 764884.

Almost surely, 2^320398825 is an apocalyptic number.

It is an amenable number.

320398825 is a deficient number, since it is larger than the sum of its proper divisors (83301589).

320398825 is an frugal number, since it uses more digits than its factorization.

320398825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 921 (or 497 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 320398825 is about 17899.6878464402. The cubic root of 320398825 is about 684.2744195160.

The spelling of 320398825 in words is "three hundred twenty million, three hundred ninety-eight thousand, eight hundred twenty-five".