7909138 has 16 divisors (see below), whose sum is σ = 12153240. Its totient is φ = 3859200.

The previous prime is 7909133. The next prime is 7909159. The reversal of 7909138 is 8319097.

It can be written as a sum of positive squares in 4 ways, for example, as 3636649 + 4272489 = 1907^2 + 2067^2 .

It is a junction number, because it is equal to n+sod(n) for n = 7909097 and 7909106.

It is not an unprimeable number, because it can be changed into a prime (7909133) 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, 29268 + ... + 29536.

Almost surely, 2^7909138 is an apocalyptic number.

7909138 is a deficient number, since it is larger than the sum of its proper divisors (4244102).

7909138 is a wasteful number, since it uses less digits than its factorization.

7909138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 7909138 is about 2812.3189719518. The cubic root of 7909138 is about 199.2399318075.

The spelling of 7909138 in words is "seven million, nine hundred nine thousand, one hundred thirty-eight".