400889665 has 16 divisors (see below), whose sum is σ = 555672960. Its totient is φ = 274405120.

The previous prime is 400889659. The next prime is 400889689. The reversal of 400889665 is 566988004.

It is not a de Polignac number, because 400889665 - 2¹³ = 400881473 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 213445 + ... + 215314.

It is an arithmetic number, because the mean of its divisors is an integer number (34729560).

Almost surely, 2^400889665 is an apocalyptic number.

It is an amenable number.

400889665 is a deficient number, since it is larger than the sum of its proper divisors (154783295).

400889665 is a wasteful number, since it uses less digits than its factorization.

400889665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428792.

The product of its (nonzero) digits is 414720, while the sum is 46.

The square root of 400889665 is about 20022.2292714872. The cubic root of 400889665 is about 737.3521542187.

The spelling of 400889665 in words is "four hundred million, eight hundred eighty-nine thousand, six hundred sixty-five".