404918181 has 12 divisors (see below), whose sum is σ = 586543308. Its totient is φ = 269178624.

The previous prime is 404918179. The next prime is 404918233. The reversal of 404918181 is 181819404.

It can be written as a sum of positive squares in 2 ways, for example, as 329749281 + 75168900 = 18159^2 + 8670^2 .

It is not a de Polignac number, because 404918181 - 2¹ = 404918179 is a prime.

It is a super-2 number, since 2×404918181² = 327917466608697522, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404918131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60550 + ... + 66903.

It is an arithmetic number, because the mean of its divisors is an integer number (48878609).

Almost surely, 2^404918181 is an apocalyptic number.

It is an amenable number.

404918181 is a deficient number, since it is larger than the sum of its proper divisors (181625127).

404918181 is a wasteful number, since it uses less digits than its factorization.

404918181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127812 (or 127809 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 404918181 is about 20122.5788854212. The cubic root of 404918181 is about 739.8137959793.

The spelling of 404918181 in words is "four hundred four million, nine hundred eighteen thousand, one hundred eighty-one".