405480389 has 2 divisors, whose sum is σ = 405480390. Its totient is φ = 405480388.

The previous prime is 405480367. The next prime is 405480401. The reversal of 405480389 is 983084504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 218064289 + 187416100 = 14767^2 + 13690^2 .

It is a cyclic number.

It is not a de Polignac number, because 405480389 - 2¹² = 405476293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405480329) 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, 202740194 + 202740195.

It is an arithmetic number, because the mean of its divisors is an integer number (202740195).

Almost surely, 2^405480389 is an apocalyptic number.

It is an amenable number.

405480389 is a deficient number, since it is larger than the sum of its proper divisors (1).

405480389 is an equidigital number, since it uses as much as digits as its factorization.

405480389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 405480389 is about 20136.5436209892. The cubic root of 405480389 is about 740.1560353943.

The spelling of 405480389 in words is "four hundred five million, four hundred eighty thousand, three hundred eighty-nine".