400843025 has 24 divisors (see below), whose sum is σ = 553785984. Its totient is φ = 285310400.

The previous prime is 400843021. The next prime is 400843039. The reversal of 400843025 is 520348004.

It is not a de Polignac number, because 400843025 - 2² = 400843021 is a prime.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400842985 and 400843003.

It is not an unprimeable number, because it can be changed into a prime (400843021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2582 + ... + 28431.

It is an arithmetic number, because the mean of its divisors is an integer number (23074416).

Almost surely, 2^400843025 is an apocalyptic number.

It is an amenable number.

400843025 is a deficient number, since it is larger than the sum of its proper divisors (152942959).

400843025 is a wasteful number, since it uses less digits than its factorization.

400843025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31081 (or 31076 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 400843025 is about 20021.0645321371. The cubic root of 400843025 is about 737.3235582889.

The spelling of 400843025 in words is "four hundred million, eight hundred forty-three thousand, twenty-five".