408216973 has 2 divisors, whose sum is σ = 408216974. Its totient is φ = 408216972.

The previous prime is 408216961. The next prime is 408217097. The reversal of 408216973 is 379612804.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213949129 + 194267844 = 14627^2 + 13938^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-408216973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (408216373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204108486 + 204108487.

It is an arithmetic number, because the mean of its divisors is an integer number (204108487).

Almost surely, 2^408216973 is an apocalyptic number.

It is an amenable number.

408216973 is a deficient number, since it is larger than the sum of its proper divisors (1).

408216973 is an equidigital number, since it uses as much as digits as its factorization.

408216973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 408216973 is about 20204.3800449309. The cubic root of 408216973 is about 741.8174059025.

The spelling of 408216973 in words is "four hundred eight million, two hundred sixteen thousand, nine hundred seventy-three".