3999942 has 20 divisors (see below), whose sum is σ = 8963196. Its totient is φ = 1333260.

The previous prime is 3999929. The next prime is 3999949. The reversal of 3999942 is 2499993.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3999949) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 12184 + ... + 12507.

Almost surely, 2^3999942 is an apocalyptic number.

3999942 is an abundant number, since it is smaller than the sum of its proper divisors (4963254).

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

3999942 is a wasteful number, since it uses less digits than its factorization.

3999942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24705 (or 24696 counting only the distinct ones).

The product of its digits is 157464, while the sum is 45.

The square root of 3999942 is about 1999.9854999474. The cubic root of 3999942 is about 158.7393379493.

The spelling of 3999942 in words is "three million, nine hundred ninety-nine thousand, nine hundred forty-two".