7125139 has 8 divisors (see below), whose sum is σ = 8309600. Its totient is φ = 6106968.

The previous prime is 7125121. The next prime is 7125169. The reversal of 7125139 is 9315217.

It is not a de Polignac number, because 7125139 - 2²¹ = 5027987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7125169) 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, 10044 + ... + 10729.

It is an arithmetic number, because the mean of its divisors is an integer number (1038700).

Almost surely, 2^7125139 is an apocalyptic number.

7125139 is a deficient number, since it is larger than the sum of its proper divisors (1184461).

7125139 is an equidigital number, since it uses as much as digits as its factorization.

7125139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20794 (or 20780 counting only the distinct ones).

The product of its digits is 1890, while the sum is 28.

The square root of 7125139 is about 2669.2955999664. The cubic root of 7125139 is about 192.4263078812.

The spelling of 7125139 in words is "seven million, one hundred twenty-five thousand, one hundred thirty-nine".