399798499 has 2 divisors, whose sum is σ = 399798500. Its totient is φ = 399798498.

The previous prime is 399798493. The next prime is 399798521. The reversal of 399798499 is 994897993.

It is a weak prime.

It is an emirp because it is prime and its reverse (994897993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399798499 - 2³ = 399798491 is a prime.

It is not a weakly prime, because it can be changed into another prime (399798491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199899249 + 199899250.

It is an arithmetic number, because the mean of its divisors is an integer number (199899250).

Almost surely, 2^399798499 is an apocalyptic number.

399798499 is a deficient number, since it is larger than the sum of its proper divisors (1).

399798499 is an equidigital number, since it uses as much as digits as its factorization.

399798499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39680928, while the sum is 67.

The square root of 399798499 is about 19994.9618404237. The cubic root of 399798499 is about 736.6825562752.

The spelling of 399798499 in words is "three hundred ninety-nine million, seven hundred ninety-eight thousand, four hundred ninety-nine".