3999542 has 4 divisors (see below), whose sum is σ = 5999316. Its totient is φ = 1999770.

The previous prime is 3999529. The next prime is 3999547. The reversal of 3999542 is 2459993.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 3999542.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3999547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999884 + ... + 999887.

It is an arithmetic number, because the mean of its divisors is an integer number (1499829).

Almost surely, 2^3999542 is an apocalyptic number.

3999542 is a deficient number, since it is larger than the sum of its proper divisors (1999774).

3999542 is a wasteful number, since it uses less digits than its factorization.

3999542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1999773.

The product of its digits is 87480, while the sum is 41.

The square root of 3999542 is about 1999.8854967222. The cubic root of 3999542 is about 158.7340463849.

The spelling of 3999542 in words is "three million, nine hundred ninety-nine thousand, five hundred forty-two".