408220913 has 2 divisors, whose sum is σ = 408220914. Its totient is φ = 408220912.

The previous prime is 408220903. The next prime is 408220919. The reversal of 408220913 is 319022804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 241087729 + 167133184 = 15527^2 + 12928^2 .

It is a cyclic number.

It is not a de Polignac number, because 408220913 - 2¹² = 408216817 is a prime.

It is not a weakly prime, because it can be changed into another prime (408220919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204110456 + 204110457.

It is an arithmetic number, because the mean of its divisors is an integer number (204110457).

Almost surely, 2^408220913 is an apocalyptic number.

It is an amenable number.

408220913 is a deficient number, since it is larger than the sum of its proper divisors (1).

408220913 is an equidigital number, since it uses as much as digits as its factorization.

408220913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 408220913 is about 20204.4775483060. The cubic root of 408220913 is about 741.8197925019.

The spelling of 408220913 in words is "four hundred eight million, two hundred twenty thousand, nine hundred thirteen".