7999742 has 4 divisors (see below), whose sum is σ = 11999616. Its totient is φ = 3999870.

The previous prime is 7999727. The next prime is 7999753. The reversal of 7999742 is 2479997.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2479997 = 13 ⋅190769.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1999934 + ... + 1999937.

It is an arithmetic number, because the mean of its divisors is an integer number (2999904).

Almost surely, 2^7999742 is an apocalyptic number.

7999742 is a deficient number, since it is larger than the sum of its proper divisors (3999874).

7999742 is a wasteful number, since it uses less digits than its factorization.

7999742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3999873.

The product of its digits is 285768, while the sum is 47.

The square root of 7999742 is about 2828.3815159911. The cubic root of 7999742 is about 199.9978499769.

The spelling of 7999742 in words is "seven million, nine hundred ninety-nine thousand, seven hundred forty-two".