400562561 has 4 divisors (see below), whose sum is σ = 457785792. Its totient is φ = 343339332.

The previous prime is 400562537. The next prime is 400562609. The reversal of 400562561 is 165265004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 400562561 - 2²² = 396368257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400562521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28611605 + ... + 28611618.

It is an arithmetic number, because the mean of its divisors is an integer number (114446448).

Almost surely, 2^400562561 is an apocalyptic number.

It is an amenable number.

400562561 is a deficient number, since it is larger than the sum of its proper divisors (57223231).

400562561 is an equidigital number, since it uses as much as digits as its factorization.

400562561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57223230.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 400562561 is about 20014.0590835542. The cubic root of 400562561 is about 737.1515533308.

It can be divided in two parts, 4005 and 62561, that added together give a palindrome (66566).

The spelling of 400562561 in words is "four hundred million, five hundred sixty-two thousand, five hundred sixty-one".