408883921 has 2 divisors, whose sum is σ = 408883922. Its totient is φ = 408883920.

The previous prime is 408883919. The next prime is 408883931. The reversal of 408883921 is 129388804.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213890625 + 194993296 = 14625^2 + 13964^2 .

It is a cyclic number.

It is not a de Polignac number, because 408883921 - 2¹ = 408883919 is a prime.

Together with 408883919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (408883931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204441960 + 204441961.

It is an arithmetic number, because the mean of its divisors is an integer number (204441961).

Almost surely, 2^408883921 is an apocalyptic number.

It is an amenable number.

408883921 is a deficient number, since it is larger than the sum of its proper divisors (1).

408883921 is an equidigital number, since it uses as much as digits as its factorization.

408883921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 110592, while the sum is 43.

The square root of 408883921 is about 20220.8783439296. The cubic root of 408883921 is about 742.2211817277.

The spelling of 408883921 in words is "four hundred eight million, eight hundred eighty-three thousand, nine hundred twenty-one".