8439742 has 4 divisors (see below), whose sum is σ = 12659616. Its totient is φ = 4219870.

The previous prime is 8439721. The next prime is 8439751. The reversal of 8439742 is 2479348.

It is a happy number.

8439742 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

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, 2109934 + ... + 2109937.

It is an arithmetic number, because the mean of its divisors is an integer number (3164904).

Almost surely, 2^8439742 is an apocalyptic number.

8439742 is a deficient number, since it is larger than the sum of its proper divisors (4219874).

8439742 is a wasteful number, since it uses less digits than its factorization.

8439742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4219873.

The product of its digits is 48384, while the sum is 37.

The square root of 8439742 is about 2905.1234052962. The cubic root of 8439742 is about 203.5993514234.

It can be divided in two parts, 843 and 9742, that added together give a triangular number (10585 = T₁₄₅).

The spelling of 8439742 in words is "eight million, four hundred thirty-nine thousand, seven hundred forty-two".