401999637 has 16 divisors (see below), whose sum is σ = 584541440. Its totient is φ = 244251072.

The previous prime is 401999623. The next prime is 401999641. The reversal of 401999637 is 736999104.

It is not a de Polignac number, because 401999637 - 2⁶ = 401999573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401999617) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62158 + ... + 68319.

It is an arithmetic number, because the mean of its divisors is an integer number (36533840).

Almost surely, 2^401999637 is an apocalyptic number.

It is an amenable number.

401999637 is a deficient number, since it is larger than the sum of its proper divisors (182541803).

401999637 is a wasteful number, since it uses less digits than its factorization.

401999637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130572.

The product of its (nonzero) digits is 367416, while the sum is 48.

The square root of 401999637 is about 20049.9286033642. The cubic root of 401999637 is about 738.0320470657.

The spelling of 401999637 in words is "four hundred one million, nine hundred ninety-nine thousand, six hundred thirty-seven".