408720493 has 2 divisors, whose sum is σ = 408720494. Its totient is φ = 408720492.

The previous prime is 408720479. The next prime is 408720509. The reversal of 408720493 is 394027804.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 321054724 + 87665769 = 17918^2 + 9363^2 .

It is a cyclic number.

It is not a de Polignac number, because 408720493 - 2¹³ = 408712301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (408720593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204360246 + 204360247.

It is an arithmetic number, because the mean of its divisors is an integer number (204360247).

Almost surely, 2^408720493 is an apocalyptic number.

It is an amenable number.

408720493 is a deficient number, since it is larger than the sum of its proper divisors (1).

408720493 is an equidigital number, since it uses as much as digits as its factorization.

408720493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 408720493 is about 20216.8368693028. The cubic root of 408720493 is about 742.1222817046.

The spelling of 408720493 in words is "four hundred eight million, seven hundred twenty thousand, four hundred ninety-three".