400393616 has 20 divisors (see below), whose sum is σ = 886586112. Its totient is φ = 171597216.

The previous prime is 400393579. The next prime is 400393649. The reversal of 400393616 is 616393004.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1787360 + ... + 1787583.

Almost surely, 2^400393616 is an apocalyptic number.

It is an amenable number.

400393616 is an abundant number, since it is smaller than the sum of its proper divisors (486192496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400393616 is a wasteful number, since it uses less digits than its factorization.

400393616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3574958 (or 3574952 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 400393616 is about 20009.8379803536. The cubic root of 400393616 is about 737.0479027868.

The spelling of 400393616 in words is "four hundred million, three hundred ninety-three thousand, six hundred sixteen".