401998181 has 8 divisors (see below), whose sum is σ = 455706720. Its totient is φ = 351544752.

The previous prime is 401998169. The next prime is 401998187. The reversal of 401998181 is 181899104.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 401998181 - 2²² = 397803877 is a prime.

It is a super-2 number, since 2×401998181² = 323205075054617522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401998187) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 813515 + ... + 814008.

It is an arithmetic number, because the mean of its divisors is an integer number (56963340).

Almost surely, 2^401998181 is an apocalyptic number.

It is an amenable number.

401998181 is a deficient number, since it is larger than the sum of its proper divisors (53708539).

401998181 is a wasteful number, since it uses less digits than its factorization.

401998181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1627555.

The product of its (nonzero) digits is 20736, while the sum is 41.

The square root of 401998181 is about 20049.8922939750. The cubic root of 401998181 is about 738.0311560401.

The spelling of 401998181 in words is "four hundred one million, nine hundred ninety-eight thousand, one hundred eighty-one".