401993718 has 32 divisors (see below), whose sum is σ = 920056320. Its totient is φ = 114703680.

The previous prime is 401993681. The next prime is 401993719. The reversal of 401993718 is 817399104.

It is a happy number.

It is a super-2 number, since 2×401993718² = 323197898622927048, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 401993718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401993719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28063 + ... + 39893.

It is an arithmetic number, because the mean of its divisors is an integer number (28751760).

Almost surely, 2^401993718 is an apocalyptic number.

401993718 is an abundant number, since it is smaller than the sum of its proper divisors (518062602).

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

401993718 is a wasteful number, since it uses less digits than its factorization.

401993718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12652.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 401993718 is about 20049.7809963102. The cubic root of 401993718 is about 738.0284248127.

The spelling of 401993718 in words is "four hundred one million, nine hundred ninety-three thousand, seven hundred eighteen".