405874489 has 2 divisors, whose sum is σ = 405874490. Its totient is φ = 405874488.

The previous prime is 405874453. The next prime is 405874493. The reversal of 405874489 is 984478504.

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., 291555625 + 114318864 = 17075^2 + 10692^2 .

It is a cyclic number.

It is not a de Polignac number, because 405874489 - 2⁹ = 405873977 is a prime.

It is a super-2 number, since 2×405874489² = 329468201642022242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (405874499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202937244 + 202937245.

It is an arithmetic number, because the mean of its divisors is an integer number (202937245).

Almost surely, 2^405874489 is an apocalyptic number.

It is an amenable number.

405874489 is a deficient number, since it is larger than the sum of its proper divisors (1).

405874489 is an equidigital number, since it uses as much as digits as its factorization.

405874489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1290240, while the sum is 49.

The square root of 405874489 is about 20146.3269356972. The cubic root of 405874489 is about 740.3957519129.

The spelling of 405874489 in words is "four hundred five million, eight hundred seventy-four thousand, four hundred eighty-nine".