7139479 has 4 divisors (see below), whose sum is σ = 7149880. Its totient is φ = 7129080.

The previous prime is 7139449. The next prime is 7139513. The reversal of 7139479 is 9749317.

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

It is a cyclic number.

It is not a de Polignac number, because 7139479 - 2⁷ = 7139351 is a prime.

It is a Duffinian number.

7139479 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7139449) 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, 4092 + ... + 5569.

It is an arithmetic number, because the mean of its divisors is an integer number (1787470).

Almost surely, 2^7139479 is an apocalyptic number.

7139479 is a deficient number, since it is larger than the sum of its proper divisors (10401).

7139479 is an equidigital number, since it uses as much as digits as its factorization.

7139479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10400.

The product of its digits is 47628, while the sum is 40.

The square root of 7139479 is about 2671.9803517242. The cubic root of 7139479 is about 192.5553132777. Note that the first 3 decimals are identical.

The spelling of 7139479 in words is "seven million, one hundred thirty-nine thousand, four hundred seventy-nine".