400775025 has 24 divisors (see below), whose sum is σ = 757274944. Its totient is φ = 183211200.

The previous prime is 400775021. The next prime is 400775033. The reversal of 400775025 is 520577004.

It is not a de Polignac number, because 400775025 - 2² = 400775021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400774983 and 400775001.

It is not an unprimeable number, because it can be changed into a prime (400775021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 381166 + ... + 382215.

Almost surely, 2^400775025 is an apocalyptic number.

It is an amenable number.

400775025 is a deficient number, since it is larger than the sum of its proper divisors (356499919).

400775025 is a wasteful number, since it uses less digits than its factorization.

400775025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763401 (or 763396 counting only the distinct ones).

The product of its (nonzero) digits is 9800, while the sum is 30.

The square root of 400775025 is about 20019.3662487103. The cubic root of 400775025 is about 737.2818621349.

The spelling of 400775025 in words is "four hundred million, seven hundred seventy-five thousand, twenty-five".