3999888 has 80 divisors (see below), whose sum is σ = 11784960. Its totient is φ = 1298304.

The previous prime is 3999871. The next prime is 3999893. The reversal of 3999888 is 8889993.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20206 + ... + 20402.

It is an arithmetic number, because the mean of its divisors is an integer number (147312).

Almost surely, 2^3999888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3999888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5892480).

3999888 is an abundant number, since it is smaller than the sum of its proper divisors (7785072).

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

3999888 is a wasteful number, since it uses less digits than its factorization.

3999888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261 (or 249 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 54.

The square root of 3999888 is about 1999.9719998040. The cubic root of 3999888 is about 158.7386236087.

The spelling of 3999888 in words is "three million, nine hundred ninety-nine thousand, eight hundred eighty-eight".