404404157 has 2 divisors, whose sum is σ = 404404158. Its totient is φ = 404404156.

The previous prime is 404404127. The next prime is 404404171. The reversal of 404404157 is 751404404.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 295118041 + 109286116 = 17179^2 + 10454^2 .

It is a cyclic number.

It is not a de Polignac number, because 404404157 - 2⁶ = 404404093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404404127) 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, 202202078 + 202202079.

It is an arithmetic number, because the mean of its divisors is an integer number (202202079).

Almost surely, 2^404404157 is an apocalyptic number.

It is an amenable number.

404404157 is a deficient number, since it is larger than the sum of its proper divisors (1).

404404157 is an equidigital number, since it uses as much as digits as its factorization.

404404157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8960, while the sum is 29.

The square root of 404404157 is about 20109.8025102187. The cubic root of 404404157 is about 739.5006108350.

The spelling of 404404157 in words is "four hundred four million, four hundred four thousand, one hundred fifty-seven".