400404040406 has 32 divisors (see below), whose sum is σ = 630664781760. Its totient is φ = 190293182464.

The previous prime is 400404040403. The next prime is 400404040423. The reversal of 400404040406 is 604040404004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400404040403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16930766 + ... + 16954398.

It is an arithmetic number, because the mean of its divisors is an integer number (19708274430).

Almost surely, 2^400404040406 is an apocalyptic number.

400404040406 is a gapful number since it is divisible by the number (46) formed by its first and last digit.

400404040406 is a deficient number, since it is larger than the sum of its proper divisors (230260741354).

400404040406 is a wasteful number, since it uses less digits than its factorization.

400404040406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25960.

The product of its (nonzero) digits is 6144, while the sum is 26.

The spelling of 400404040406 in words is "four hundred billion, four hundred four million, forty thousand, four hundred six".