401818 has 4 divisors (see below), whose sum is σ = 602730. Its totient is φ = 200908.

The previous prime is 401813. The next prime is 401827. The reversal of 401818 is 818104.

401818 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 388129 + 13689 = 623^2 + 117^2 .

It is a super-2 number, since 2×401818² = 322915410248, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

401818 is a modest number, since divided by 1818 gives 40 as remainder.

It is not an unprimeable number, because it can be changed into a prime (401813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100453 + ... + 100456.

2⁴⁰¹⁸¹⁸ is an apocalyptic number.

401818 is a deficient number, since it is larger than the sum of its proper divisors (200912).

401818 is a wasteful number, since it uses less digits than its factorization.

401818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200911.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 401818 is about 633.8911578497. The cubic root of 401818 is about 73.7920874393.

The spelling of 401818 in words is "four hundred one thousand, eight hundred eighteen".