401999636 has 12 divisors (see below), whose sum is σ = 703667328. Its totient is φ = 200951832.

The previous prime is 401999623. The next prime is 401999641. The reversal of 401999636 is 636999104.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12335 + ... + 30921.

It is an arithmetic number, because the mean of its divisors is an integer number (58638944).

Almost surely, 2^401999636 is an apocalyptic number.

It is an amenable number.

401999636 is a deficient number, since it is larger than the sum of its proper divisors (301667692).

401999636 is a wasteful number, since it uses less digits than its factorization.

401999636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23998 (or 23996 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 47.

The square root of 401999636 is about 20049.9285784264. The cubic root of 401999636 is about 738.0320464537.

The spelling of 401999636 in words is "four hundred one million, nine hundred ninety-nine thousand, six hundred thirty-six".