7138879 has 12 divisors (see below), whose sum is σ = 8043840. Its totient is φ = 6327200.

The previous prime is 7138867. The next prime is 7138883. The reversal of 7138879 is 9788317.

7138879 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 7138879 - 2⁷ = 7138751 is a prime.

It is a Duffinian number.

7138879 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7138819) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4242 + ... + 5680.

It is an arithmetic number, because the mean of its divisors is an integer number (670320).

Almost surely, 2^7138879 is an apocalyptic number.

7138879 is a deficient number, since it is larger than the sum of its proper divisors (904961).

7138879 is a wasteful number, since it uses less digits than its factorization.

7138879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1502 (or 1491 counting only the distinct ones).

The product of its digits is 84672, while the sum is 43.

The square root of 7138879 is about 2671.8680730904. The cubic root of 7138879 is about 192.5499190267.

The spelling of 7138879 in words is "seven million, one hundred thirty-eight thousand, eight hundred seventy-nine".