400655887 has 2 divisors, whose sum is σ = 400655888. Its totient is φ = 400655886.

The previous prime is 400655861. The next prime is 400655891. The reversal of 400655887 is 788556004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400655887 - 2¹¹ = 400653839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400655807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200327943 + 200327944.

It is an arithmetic number, because the mean of its divisors is an integer number (200327944).

Almost surely, 2^400655887 is an apocalyptic number.

400655887 is a deficient number, since it is larger than the sum of its proper divisors (1).

400655887 is an equidigital number, since it uses as much as digits as its factorization.

400655887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 268800, while the sum is 43.

The square root of 400655887 is about 20016.3904588215. The cubic root of 400655887 is about 737.2087978750.

The spelling of 400655887 in words is "four hundred million, six hundred fifty-five thousand, eight hundred eighty-seven".