3999742 has 4 divisors (see below), whose sum is σ = 5999616. Its totient is φ = 1999870.

The previous prime is 3999739. The next prime is 3999763. The reversal of 3999742 is 2479993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2479993 = 29 ⋅85517.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999934 + ... + 999937.

It is an arithmetic number, because the mean of its divisors is an integer number (1499904).

Almost surely, 2^3999742 is an apocalyptic number.

3999742 is a deficient number, since it is larger than the sum of its proper divisors (1999874).

3999742 is a wasteful number, since it uses less digits than its factorization.

3999742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1999873.

The product of its digits is 122472, while the sum is 43.

The square root of 3999742 is about 1999.9354989599. The cubic root of 3999742 is about 158.7366922112.

Adding to 3999742 its product of digits (122472), we get a palindrome (4122214).

The spelling of 3999742 in words is "three million, nine hundred ninety-nine thousand, seven hundred forty-two".