400709863 has 2 divisors, whose sum is σ = 400709864. Its totient is φ = 400709862.

The previous prime is 400709857. The next prime is 400709917. The reversal of 400709863 is 368907004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400709863 - 2⁵ = 400709831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400719863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200354931 + 200354932.

It is an arithmetic number, because the mean of its divisors is an integer number (200354932).

Almost surely, 2^400709863 is an apocalyptic number.

400709863 is a deficient number, since it is larger than the sum of its proper divisors (1).

400709863 is an equidigital number, since it uses as much as digits as its factorization.

400709863 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 400709863 is about 20017.7387084556. The cubic root of 400709863 is about 737.2419017568.

The spelling of 400709863 in words is "four hundred million, seven hundred nine thousand, eight hundred sixty-three".