404489213 has 2 divisors, whose sum is σ = 404489214. Its totient is φ = 404489212.

The previous prime is 404489203. The next prime is 404489297. The reversal of 404489213 is 312984404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 334816804 + 69672409 = 18298^2 + 8347^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404489213 is a prime.

It is a super-2 number, since 2×404489213² = 327223046866718738, which contains 22 as substring.

It is equal to p_21562784 and since 404489213 and 21562784 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404489203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202244606 + 202244607.

It is an arithmetic number, because the mean of its divisors is an integer number (202244607).

Almost surely, 2^404489213 is an apocalyptic number.

It is an amenable number.

404489213 is a deficient number, since it is larger than the sum of its proper divisors (1).

404489213 is an equidigital number, since it uses as much as digits as its factorization.

404489213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 404489213 is about 20111.9171885726. The cubic root of 404489213 is about 739.5524521705.

The spelling of 404489213 in words is "four hundred four million, four hundred eighty-nine thousand, two hundred thirteen".