400631206887 has 12 divisors (see below), whose sum is σ = 598644332520. Its totient is φ = 257877558288.

The previous prime is 400631206861. The next prime is 400631206897. The reversal of 400631206887 is 788602136004.

400631206887 is a `hidden beast` number, since 4 + 0 + 0 + 631 + 2 + 0 + 6 + 8 + 8 + 7 = 666.

It is not a de Polignac number, because 400631206887 - 2⁸ = 400631206631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400631206897) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 767492473 + ... + 767492994.

It is an arithmetic number, because the mean of its divisors is an integer number (49887027710).

Almost surely, 2^400631206887 is an apocalyptic number.

400631206887 is a deficient number, since it is larger than the sum of its proper divisors (198013125633).

400631206887 is a wasteful number, since it uses less digits than its factorization.

400631206887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1534985502 (or 1534985499 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The spelling of 400631206887 in words is "four hundred billion, six hundred thirty-one million, two hundred six thousand, eight hundred eighty-seven".