399280325 has 12 divisors (see below), whose sum is σ = 495618948. Its totient is φ = 319094400.

The previous prime is 399280303. The next prime is 399280363. The reversal of 399280325 is 523082993.

It is a Cunningham number, because it is equal to 19982²+1.

It can be written as a sum of positive squares in 6 ways, for example, as 1 + 399280324 = 1^2 + 19982^2 .

It is not a de Polignac number, because 399280325 - 2⁶ = 399280261 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, 18095 + ... + 33555.

It is an arithmetic number, because the mean of its divisors is an integer number (41301579).

Almost surely, 2^399280325 is an apocalyptic number.

It is an amenable number.

399280325 is a deficient number, since it is larger than the sum of its proper divisors (96338623).

399280325 is a wasteful number, since it uses less digits than its factorization.

399280325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16504 (or 16499 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 399280325 is about 19982.0000250225. Note that the first 4 decimals coincide. The cubic root of 399280325 is about 736.3641502239.

The spelling of 399280325 in words is "three hundred ninety-nine million, two hundred eighty thousand, three hundred twenty-five".