3999618 has 40 divisors (see below), whose sum is σ = 10245312. Its totient is φ = 1142424.

The previous prime is 3999599. The next prime is 3999623. The reversal of 3999618 is 8169993.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 630 + ... + 2897.

Almost surely, 2^3999618 is an apocalyptic number.

3999618 is an abundant number, since it is smaller than the sum of its proper divisors (6245694).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3999618 is a wasteful number, since it uses less digits than its factorization.

3999618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3548 (or 3539 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 3999618 is about 1999.9044977198. The cubic root of 3999618 is about 158.7350518093.

The spelling of 3999618 in words is "three million, nine hundred ninety-nine thousand, six hundred eighteen".