401853618 has 24 divisors (see below), whose sum is σ = 871130988. Its totient is φ = 133882272.

The previous prime is 401853611. The next prime is 401853643. The reversal of 401853618 is 816358104.

It can be written as a sum of positive squares in 2 ways, for example, as 401721849 + 131769 = 20043^2 + 363^2 .

It is a super-2 number, since 2×401853618² = 322972660599379848, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (401853611) 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, 40080 + ... + 49092.

Almost surely, 2^401853618 is an apocalyptic number.

401853618 is an abundant number, since it is smaller than the sum of its proper divisors (469277370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

401853618 is a wasteful number, since it uses less digits than its factorization.

401853618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11498 (or 11495 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 401853618 is about 20046.2868880998. The cubic root of 401853618 is about 737.9426773729.

The spelling of 401853618 in words is "four hundred one million, eight hundred fifty-three thousand, six hundred eighteen".