7980139 has 4 divisors (see below), whose sum is σ = 7995024. Its totient is φ = 7965256.

The previous prime is 7980121. The next prime is 7980143. The reversal of 7980139 is 9310897.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9310897 = 269 ⋅34613.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7980139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7980098 and 7980107.

It is not an unprimeable number, because it can be changed into a prime (7980179) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 6607 + ... + 7720.

It is an arithmetic number, because the mean of its divisors is an integer number (1998756).

Almost surely, 2^7980139 is an apocalyptic number.

7980139 is a deficient number, since it is larger than the sum of its proper divisors (14885).

7980139 is a wasteful number, since it uses less digits than its factorization.

7980139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14884.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 7980139 is about 2824.9139809913. The cubic root of 7980139 is about 199.8343545124.

The spelling of 7980139 in words is "seven million, nine hundred eighty thousand, one hundred thirty-nine".