400400887 has 2 divisors, whose sum is σ = 400400888. Its totient is φ = 400400886.

The previous prime is 400400857. The next prime is 400400893. The reversal of 400400887 is 788004004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400400887 - 2²³ = 392012279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400400807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200200443 + 200200444.

It is an arithmetic number, because the mean of its divisors is an integer number (200200444).

Almost surely, 2^400400887 is an apocalyptic number.

400400887 is a deficient number, since it is larger than the sum of its proper divisors (1).

400400887 is an equidigital number, since it uses as much as digits as its factorization.

400400887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7168, while the sum is 31.

The square root of 400400887 is about 20010.0196651578. The cubic root of 400400887 is about 737.0523642655.

The spelling of 400400887 in words is "four hundred million, four hundred thousand, eight hundred eighty-seven".