400561065 has 16 divisors (see below), whose sum is σ = 712108800. Its totient is φ = 213632496.

The previous prime is 400561061. The next prime is 400561081. The reversal of 400561065 is 560165004.

It is a happy number.

400561065 is a `hidden beast` number, since 40 + 0 + 5 + 610 + 6 + 5 = 666.

It is not a de Polignac number, because 400561065 - 2² = 400561061 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (400561061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1483425 + ... + 1483694.

It is an arithmetic number, because the mean of its divisors is an integer number (44506800).

Almost surely, 2^400561065 is an apocalyptic number.

400561065 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

400561065 is a deficient number, since it is larger than the sum of its proper divisors (311547735).

400561065 is a wasteful number, since it uses less digits than its factorization.

400561065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2967133 (or 2967127 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 400561065 is about 20014.0217097914. The cubic root of 400561065 is about 737.1506356380.

The spelling of 400561065 in words is "four hundred million, five hundred sixty-one thousand, sixty-five".