3993918 has 16 divisors (see below), whose sum is σ = 8021376. Its totient is φ = 1325720.

The previous prime is 3993911. The next prime is 3993943. The reversal of 3993918 is 8193993.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 3993918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3993911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 313 + ... + 2843.

It is an arithmetic number, because the mean of its divisors is an integer number (501336).

Almost surely, 2^3993918 is an apocalyptic number.

3993918 is an abundant number, since it is smaller than the sum of its proper divisors (4027458).

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

3993918 is a wasteful number, since it uses less digits than its factorization.

3993918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2799.

The product of its digits is 52488, while the sum is 42.

The square root of 3993918 is about 1998.4789215801. The cubic root of 3993918 is about 158.6596096085.

The spelling of 3993918 in words is "three million, nine hundred ninety-three thousand, nine hundred eighteen".