408305897 has 2 divisors, whose sum is σ = 408305898. Its totient is φ = 408305896.

The previous prime is 408305869. The next prime is 408305903. The reversal of 408305897 is 798503804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 296390656 + 111915241 = 17216^2 + 10579^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-408305897 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (408305797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204152948 + 204152949.

It is an arithmetic number, because the mean of its divisors is an integer number (204152949).

Almost surely, 2^408305897 is an apocalyptic number.

It is an amenable number.

408305897 is a deficient number, since it is larger than the sum of its proper divisors (1).

408305897 is an equidigital number, since it uses as much as digits as its factorization.

408305897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 408305897 is about 20206.5805370429. The cubic root of 408305897 is about 741.8712666237.

The spelling of 408305897 in words is "four hundred eight million, three hundred five thousand, eight hundred ninety-seven".