404200421 has 2 divisors, whose sum is σ = 404200422. Its totient is φ = 404200420.

The previous prime is 404200411. The next prime is 404200453. The reversal of 404200421 is 124002404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 378302500 + 25897921 = 19450^2 + 5089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404200421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 404200421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404200411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202100210 + 202100211.

It is an arithmetic number, because the mean of its divisors is an integer number (202100211).

Almost surely, 2^404200421 is an apocalyptic number.

It is an amenable number.

404200421 is a deficient number, since it is larger than the sum of its proper divisors (1).

404200421 is an equidigital number, since it uses as much as digits as its factorization.

404200421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 404200421 is about 20104.7362827768. The cubic root of 404200421 is about 739.3764048875.

Adding to 404200421 its reverse (124002404), we get a palindrome (528202825).

The spelling of 404200421 in words is "four hundred four million, two hundred thousand, four hundred twenty-one".