7872749139 has 4 divisors (see below), whose sum is σ = 10496998856. Its totient is φ = 5248499424.

The previous prime is 7872749107. The next prime is 7872749141. The reversal of 7872749139 is 9319472787.

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

It is not a de Polignac number, because 7872749139 - 2⁵ = 7872749107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7872749639) 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, 1312124854 + ... + 1312124859.

It is an arithmetic number, because the mean of its divisors is an integer number (2624249714).

Almost surely, 2^7872749139 is an apocalyptic number.

7872749139 is a deficient number, since it is larger than the sum of its proper divisors (2624249717).

7872749139 is a wasteful number, since it uses less digits than its factorization.

7872749139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2624249716.

The product of its digits is 5334336, while the sum is 57.

The square root of 7872749139 is about 88728.5136751428. The cubic root of 7872749139 is about 1989.3390344640.

The spelling of 7872749139 in words is "seven billion, eight hundred seventy-two million, seven hundred forty-nine thousand, one hundred thirty-nine".