399766225 has 6 divisors (see below), whose sum is σ = 495710150. Its totient is φ = 319812960.

The previous prime is 399766223. The next prime is 399766229. The reversal of 399766225 is 522667993.

It can be written as a sum of positive squares in 3 ways, for example, as 9585216 + 390181009 = 3096^2 + 19753^2 .

It is not a de Polignac number, because 399766225 - 2¹ = 399766223 is a prime.

It is not an unprimeable number, because it can be changed into a prime (399766223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7995300 + ... + 7995349.

Almost surely, 2^399766225 is an apocalyptic number.

It is an amenable number.

399766225 is a deficient number, since it is larger than the sum of its proper divisors (95943925).

399766225 is a wasteful number, since it uses less digits than its factorization.

399766225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15990659 (or 15990654 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 49.

The square root of 399766225 is about 19994.1547708324. The cubic root of 399766225 is about 736.6627326785.

The spelling of 399766225 in words is "three hundred ninety-nine million, seven hundred sixty-six thousand, two hundred twenty-five".