400595491 has 4 divisors (see below), whose sum is σ = 405666400. Its totient is φ = 395524584.

The previous prime is 400595477. The next prime is 400595519. The reversal of 400595491 is 194595004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 400595491 - 2¹⁷ = 400464419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 400595491.

It is not an unprimeable number, because it can be changed into a prime (400595401) 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, 2535336 + ... + 2535493.

It is an arithmetic number, because the mean of its divisors is an integer number (101416600).

Almost surely, 2^400595491 is an apocalyptic number.

400595491 is a deficient number, since it is larger than the sum of its proper divisors (5070909).

400595491 is an equidigital number, since it uses as much as digits as its factorization.

400595491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5070908.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 400595491 is about 20014.8817383466. The cubic root of 400595491 is about 737.1717530348.

The spelling of 400595491 in words is "four hundred million, five hundred ninety-five thousand, four hundred ninety-one".