400250565 has 80 divisors (see below), whose sum is σ = 843042816. Its totient is φ = 179107200.

The previous prime is 400250537. The next prime is 400250573. The reversal of 400250565 is 565052004.

400250565 is a `hidden beast` number, since 400 + 250 + 5 + 6 + 5 = 666.

It is not a de Polignac number, because 400250565 - 2⁷ = 400250437 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

Together with 442792251 it forms an amicable pair .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 54460 + ... + 61370.

Almost surely, 2^400250565 is an apocalyptic number.

400250565 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

400250565 is an abundant number, since it is smaller than the sum of its proper divisors (442792251).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400250565 is a wasteful number, since it uses less digits than its factorization.

400250565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6952 (or 6943 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 400250565 is about 20006.2631443256. The cubic root of 400250565 is about 736.9601158405.

The spelling of 400250565 in words is "four hundred million, two hundred fifty thousand, five hundred sixty-five".