400400404 has 12 divisors (see below), whose sum is σ = 701502228. Its totient is φ = 199971200.

The previous prime is 400400389. The next prime is 400400437. The reversal of 400400404 is 404004004.

It can be written as a sum of positive squares in 2 ways, for example, as 129732100 + 270668304 = 11390^2 + 16452^2 .

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, 53287 + ... + 60334.

It is an arithmetic number, because the mean of its divisors is an integer number (58458519).

Almost surely, 2^400400404 is an apocalyptic number.

It is an amenable number.

400400404 is a deficient number, since it is larger than the sum of its proper divisors (301101824).

400400404 is a wasteful number, since it uses less digits than its factorization.

400400404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114506 (or 114504 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 400400404 is about 20010.0075962005. The cubic root of 400400404 is about 737.0520678989.

Adding to 400400404 its reverse (404004004), we get a palindrome (804404408).

The spelling of 400400404 in words is "four hundred million, four hundred thousand, four hundred four".