400373663 has 2 divisors, whose sum is σ = 400373664. Its totient is φ = 400373662.

The previous prime is 400373653. The next prime is 400373689. The reversal of 400373663 is 366373004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400373663 - 2⁶ = 400373599 is a prime.

It is equal to p_21355187 and since 400373663 and 21355187 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400373653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200186831 + 200186832.

It is an arithmetic number, because the mean of its divisors is an integer number (200186832).

Almost surely, 2^400373663 is an apocalyptic number.

400373663 is a deficient number, since it is larger than the sum of its proper divisors (1).

400373663 is an equidigital number, since it uses as much as digits as its factorization.

400373663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 32.

The square root of 400373663 is about 20009.3393943928. The cubic root of 400373663 is about 737.0356593672.

The spelling of 400373663 in words is "four hundred million, three hundred seventy-three thousand, six hundred sixty-three".