408879661 has 4 divisors (see below), whose sum is σ = 408966300. Its totient is φ = 408793024.

The previous prime is 408879629. The next prime is 408879701. The reversal of 408879661 is 166978804.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 257442025 + 151437636 = 16045^2 + 12306^2 .

It is a cyclic number.

It is not a de Polignac number, because 408879661 - 2⁵ = 408879629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (408879061) 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 in 3 ways as a sum of consecutive naturals, for example, 35806 + ... + 45823.

It is an arithmetic number, because the mean of its divisors is an integer number (102241575).

Almost surely, 2^408879661 is an apocalyptic number.

It is an amenable number.

408879661 is a deficient number, since it is larger than the sum of its proper divisors (86639).

408879661 is an equidigital number, since it uses as much as digits as its factorization.

408879661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86638.

The product of its (nonzero) digits is 580608, while the sum is 49.

The square root of 408879661 is about 20220.7730069847. The cubic root of 408879661 is about 742.2186040824.

The spelling of 408879661 in words is "four hundred eight million, eight hundred seventy-nine thousand, six hundred sixty-one".