400400408 has 16 divisors (see below), whose sum is σ = 750982560. Its totient is φ = 200138400.

The previous prime is 400400389. The next prime is 400400437. The reversal of 400400408 is 804004004.

It is a self number, because there is not a number n which added to its sum of digits gives 400400408.

It is a congruent 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, 31553 + ... + 42383.

It is an arithmetic number, because the mean of its divisors is an integer number (46936410).

Almost surely, 2^400400408 is an apocalyptic number.

It is an amenable number.

400400408 is a deficient number, since it is larger than the sum of its proper divisors (350582152).

400400408 is a wasteful number, since it uses less digits than its factorization.

400400408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15458 (or 15454 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 400400408 is about 20010.0076961504. The cubic root of 400400408 is about 737.0520703533.

The spelling of 400400408 in words is "four hundred million, four hundred thousand, four hundred eight".