3999699 has 30 divisors (see below), whose sum is σ = 6616764. Its totient is φ = 2387880.

The previous prime is 3999683. The next prime is 3999703. The reversal of 3999699 is 9969993.

It is not a de Polignac number, because 3999699 - 2⁴ = 3999683 is a prime.

Its product of digits (1062882) is a multiple of the sum of its prime divisors (81).

It is not an unprimeable number, because it can be changed into a prime (3999629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 59664 + ... + 59730.

Almost surely, 2^3999699 is an apocalyptic number.

3999699 is a deficient number, since it is larger than the sum of its proper divisors (2617065).

3999699 is an equidigital number, since it uses as much as digits as its factorization.

3999699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157 (or 81 counting only the distinct ones).

The product of its digits is 1062882, while the sum is 54.

The square root of 3999699 is about 1999.9247485843. The cubic root of 3999699 is about 158.7361233660.

The spelling of 3999699 in words is "three million, nine hundred ninety-nine thousand, six hundred ninety-nine".