400418018 has 32 divisors (see below), whose sum is σ = 806440320. Its totient is φ = 144005760.

The previous prime is 400418009. The next prime is 400418023. The reversal of 400418018 is 810814004.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (26).

400418018 is a modest number, since divided by 18018 gives 4004 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98003 + ... + 102006.

It is an arithmetic number, because the mean of its divisors is an integer number (25201260).

Almost surely, 2^400418018 is an apocalyptic number.

400418018 is an abundant number, since it is smaller than the sum of its proper divisors (406022302).

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

400418018 is a wasteful number, since it uses less digits than its factorization.

400418018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200042.

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 400418018 is about 20010.4477211281. The cubic root of 400418018 is about 737.0628756175.

It can be divided in two parts, 4004 and 18018, that added together give a palindrome (22022).

The spelling of 400418018 in words is "four hundred million, four hundred eighteen thousand, eighteen".