7917138 has 24 divisors (see below), whose sum is σ = 18163548. Its totient is φ = 2483712.

The previous prime is 7917137. The next prime is 7917179. The reversal of 7917138 is 8317197.

7917138 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 7767369 + 149769 = 2787^2 + 387^2 .

It is a super-2 number, since 2×7917138² = 125362148222088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7917137) 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, 12631 + ... + 13242.

Almost surely, 2^7917138 is an apocalyptic number.

7917138 is an abundant number, since it is smaller than the sum of its proper divisors (10246410).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7917138 is a wasteful number, since it uses less digits than its factorization.

7917138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25898 (or 25895 counting only the distinct ones).

The product of its digits is 10584, while the sum is 36.

The square root of 7917138 is about 2813.7409262404. The cubic root of 7917138 is about 199.3070854529.

The spelling of 7917138 in words is "seven million, nine hundred seventeen thousand, one hundred thirty-eight".