404421187 has 2 divisors, whose sum is σ = 404421188. Its totient is φ = 404421186.

The previous prime is 404421169. The next prime is 404421203. The reversal of 404421187 is 781124404.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 404421187 - 2²⁷ = 270203459 is a prime.

It is not a weakly prime, because it can be changed into another prime (404421487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202210593 + 202210594.

It is an arithmetic number, because the mean of its divisors is an integer number (202210594).

Almost surely, 2^404421187 is an apocalyptic number.

404421187 is a deficient number, since it is larger than the sum of its proper divisors (1).

404421187 is an equidigital number, since it uses as much as digits as its factorization.

404421187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7168, while the sum is 31.

The square root of 404421187 is about 20110.2259311028. The cubic root of 404421187 is about 739.5109911426.

The spelling of 404421187 in words is "four hundred four million, four hundred twenty-one thousand, one hundred eighty-seven".