404021129 has 2 divisors, whose sum is σ = 404021130. Its totient is φ = 404021128.

The previous prime is 404021119. The next prime is 404021159. The reversal of 404021129 is 921120404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 318551104 + 85470025 = 17848^2 + 9245^2 .

It is a cyclic number.

It is not a de Polignac number, because 404021129 - 2²⁸ = 135585673 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (404021119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202010564 + 202010565.

It is an arithmetic number, because the mean of its divisors is an integer number (202010565).

Almost surely, 2^404021129 is an apocalyptic number.

It is an amenable number.

404021129 is a deficient number, since it is larger than the sum of its proper divisors (1).

404021129 is an equidigital number, since it uses as much as digits as its factorization.

404021129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 404021129 is about 20100.2768388896. The cubic root of 404021129 is about 739.2670664892.

The spelling of 404021129 in words is "four hundred four million, twenty-one thousand, one hundred twenty-nine".