404188139 has 2 divisors, whose sum is σ = 404188140. Its totient is φ = 404188138.

The previous prime is 404188117. The next prime is 404188181. The reversal of 404188139 is 931881404.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 404188139 - 2²⁰ = 403139563 is a prime.

It is not a weakly prime, because it can be changed into another prime (404188339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202094069 + 202094070.

It is an arithmetic number, because the mean of its divisors is an integer number (202094070).

Almost surely, 2^404188139 is an apocalyptic number.

404188139 is a deficient number, since it is larger than the sum of its proper divisors (1).

404188139 is an equidigital number, since it uses as much as digits as its factorization.

404188139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 404188139 is about 20104.4308300434. The cubic root of 404188139 is about 739.3689159352.

The spelling of 404188139 in words is "four hundred four million, one hundred eighty-eight thousand, one hundred thirty-nine".