399818499 has 32 divisors (see below), whose sum is σ = 568249344. Its totient is φ = 249532800.

The previous prime is 399818477. The next prime is 399818509. The reversal of 399818499 is 994818993.

It is a happy number.

It is not a de Polignac number, because 399818499 - 2⁵ = 399818467 is a prime.

It is a super-2 number, since 2×399818499² = 319709664285226002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (399818459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 717529 + ... + 718085.

It is an arithmetic number, because the mean of its divisors is an integer number (17757792).

Almost surely, 2^399818499 is an apocalyptic number.

399818499 is a deficient number, since it is larger than the sum of its proper divisors (168430845).

399818499 is a wasteful number, since it uses less digits than its factorization.

399818499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787.

The product of its digits is 5038848, while the sum is 60.

The square root of 399818499 is about 19995.4619601549. The cubic root of 399818499 is about 736.6948403012.

The spelling of 399818499 in words is "three hundred ninety-nine million, eight hundred eighteen thousand, four hundred ninety-nine".