408188081 has 6 divisors (see below), whose sum is σ = 474831090. Its totient is φ = 349875456.

The previous prime is 408188069. The next prime is 408188089. The reversal of 408188081 is 180881804.

It can be written as a sum of positive squares in only one way, i.e., 223771681 + 184416400 = 14959^2 + 13580^2 .

It is not a de Polignac number, because 408188081 - 2¹⁴ = 408171697 is a prime.

It is a super-2 number, since 2×408188081² = 333235018940925122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (408188089) 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 5 ways as a sum of consecutive naturals, for example, 4165136 + ... + 4165233.

It is an arithmetic number, because the mean of its divisors is an integer number (79138515).

Almost surely, 2^408188081 is an apocalyptic number.

It is an amenable number.

408188081 is a deficient number, since it is larger than the sum of its proper divisors (66643009).

408188081 is an equidigital number, since it uses as much as digits as its factorization.

408188081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8330383 (or 8330376 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 38.

The square root of 408188081 is about 20203.6650387993. The cubic root of 408188081 is about 741.7999045118.

The spelling of 408188081 in words is "four hundred eight million, one hundred eighty-eight thousand, eighty-one".