400505025 has 12 divisors (see below), whose sum is σ = 662168432. Its totient is φ = 213602640.

The previous prime is 400505011. The next prime is 400505033. The reversal of 400505025 is 520505004.

It is not a de Polignac number, because 400505025 - 2¹⁰ = 400504001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 400504992 and 400505010.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2669959 + ... + 2670108.

Almost surely, 2^400505025 is an apocalyptic number.

It is an amenable number.

400505025 is a deficient number, since it is larger than the sum of its proper divisors (261663407).

400505025 is a wasteful number, since it uses less digits than its factorization.

400505025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5340080 (or 5340075 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 21.

The square root of 400505025 is about 20012.6216423536. The cubic root of 400505025 is about 737.1162573190.

Subtracting from 400505025 its sum of digits (21), we obtain a palindrome (400505004).

The spelling of 400505025 in words is "four hundred million, five hundred five thousand, twenty-five".