7139945 has 16 divisors (see below), whose sum is σ = 9087120. Its totient is φ = 5376000.

The previous prime is 7139939. The next prime is 7139947. The reversal of 7139945 is 5499317.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 3055504 + 4084441 = 1748^2 + 2021^2 .

It is a de Polignac number, because none of the positive numbers 2^k-7139945 is a prime.

It is a zygodrome in base 7.

It is a junction number, because it is equal to n+sod(n) for n = 7139899 and 7139908.

It is not an unprimeable number, because it can be changed into a prime (7139947) 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 15 ways as a sum of consecutive naturals, for example, 5345 + ... + 6545.

It is an arithmetic number, because the mean of its divisors is an integer number (567945).

Almost surely, 2^7139945 is an apocalyptic number.

It is an amenable number.

7139945 is a deficient number, since it is larger than the sum of its proper divisors (1947175).

7139945 is a wasteful number, since it uses less digits than its factorization.

7139945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1276.

The product of its digits is 34020, while the sum is 38.

The square root of 7139945 is about 2672.0675515413. The cubic root of 7139945 is about 192.5595026041.

The spelling of 7139945 in words is "seven million, one hundred thirty-nine thousand, nine hundred forty-five".