400445816 has 16 divisors (see below), whose sum is σ = 751113000. Its totient is φ = 200149024.

The previous prime is 400445813. The next prime is 400445821. The reversal of 400445816 is 618544004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400445813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18806 + ... + 33978.

Almost surely, 2^400445816 is an apocalyptic number.

It is an amenable number.

400445816 is a deficient number, since it is larger than the sum of its proper divisors (350667184).

400445816 is a wasteful number, since it uses less digits than its factorization.

400445816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18478 (or 18474 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 400445816 is about 20011.1422962309. The cubic root of 400445816 is about 737.0799314598.

The spelling of 400445816 in words is "four hundred million, four hundred forty-five thousand, eight hundred sixteen".