7942439 has 4 divisors (see below), whose sum is σ = 7955256. Its totient is φ = 7929624.

The previous prime is 7942427. The next prime is 7942447. The reversal of 7942439 is 9342497.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9342497 = 1223 ⋅7639.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7942439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7942469) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5429 + ... + 6734.

It is an arithmetic number, because the mean of its divisors is an integer number (1988814).

Almost surely, 2^7942439 is an apocalyptic number.

7942439 is a deficient number, since it is larger than the sum of its proper divisors (12817).

7942439 is a wasteful number, since it uses less digits than its factorization.

7942439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12816.

The product of its digits is 54432, while the sum is 38.

The square root of 7942439 is about 2818.2333118463. The cubic root of 7942439 is about 199.5191699386.

The spelling of 7942439 in words is "seven million, nine hundred forty-two thousand, four hundred thirty-nine".