408706993 has 2 divisors, whose sum is σ = 408706994. Its totient is φ = 408706992.

The previous prime is 408706973. The next prime is 408706999. The reversal of 408706993 is 399607804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 298183824 + 110523169 = 17268^2 + 10513^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-408706993 is a prime.

It is a super-2 number, since 2×408706993² = 334082812254204098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (408706999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204353496 + 204353497.

It is an arithmetic number, because the mean of its divisors is an integer number (204353497).

Almost surely, 2^408706993 is an apocalyptic number.

It is an amenable number.

408706993 is a deficient number, since it is larger than the sum of its proper divisors (1).

408706993 is an equidigital number, since it uses as much as digits as its factorization.

408706993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 408706993 is about 20216.5029864218. The cubic root of 408706993 is about 742.1141108712.

The spelling of 408706993 in words is "four hundred eight million, seven hundred six thousand, nine hundred ninety-three".