7942639 has 8 divisors (see below), whose sum is σ = 8161920. Its totient is φ = 7726296.

The previous prime is 7942609. The next prime is 7942663. The reversal of 7942639 is 9362497.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7942639 - 2⁷ = 7942511 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 (7942609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5424 + ... + 6730.

It is an arithmetic number, because the mean of its divisors is an integer number (1020240).

Almost surely, 2^7942639 is an apocalyptic number.

7942639 is a deficient number, since it is larger than the sum of its proper divisors (219281).

7942639 is a wasteful number, since it uses less digits than its factorization.

7942639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1469.

The product of its digits is 81648, while the sum is 40.

The square root of 7942639 is about 2818.2687948455. The cubic root of 7942639 is about 199.5208446341.

The spelling of 7942639 in words is "seven million, nine hundred forty-two thousand, six hundred thirty-nine".