400465565819 has 4 divisors (see below), whose sum is σ = 436871526360. Its totient is φ = 364059605280.

The previous prime is 400465565809. The next prime is 400465565833. The reversal of 400465565819 is 918565564004.

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 400465565819 - 2²⁴ = 400448788603 is a prime.

It is a super-2 number, since 2×400465565819² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400465565809) 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, 18202980254 + ... + 18202980275.

It is an arithmetic number, because the mean of its divisors is an integer number (109217881590).

Almost surely, 2^400465565819 is an apocalyptic number.

400465565819 is a deficient number, since it is larger than the sum of its proper divisors (36405960541).

400465565819 is a wasteful number, since it uses less digits than its factorization.

400465565819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36405960540.

The product of its (nonzero) digits is 5184000, while the sum is 53.

The spelling of 400465565819 in words is "four hundred billion, four hundred sixty-five million, five hundred sixty-five thousand, eight hundred nineteen".