400320025 has 24 divisors (see below), whose sum is σ = 597174080. Its totient is φ = 260055360.

The previous prime is 400320017. The next prime is 400320047. The reversal of 400320025 is 520023004.

It is not a de Polignac number, because 400320025 - 2³ = 400320017 is a prime.

It is a super-2 number, since 2×400320025² = 320512244832001250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 400319990 and 400320008.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56874 + ... + 63523.

Almost surely, 2^400320025 is an apocalyptic number.

It is an amenable number.

400320025 is a deficient number, since it is larger than the sum of its proper divisors (196854055).

400320025 is a wasteful number, since it uses less digits than its factorization.

400320025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120433 (or 120428 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 16.

The square root of 400320025 is about 20007.9990253898. Note that the first 3 decimals coincide. The cubic root of 400320025 is about 737.0027443781.

Adding to 400320025 its reverse (520023004), we get a palindrome (920343029).

The spelling of 400320025 in words is "four hundred million, three hundred twenty thousand, twenty-five".