7911138 has 16 divisors (see below), whose sum is σ = 16333056. Its totient is φ = 2551920.

The previous prime is 7911119. The next prime is 7911143. The reversal of 7911138 is 8311197.

It is a super-2 number, since 2×7911138² = 125172208910088, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 21081 + ... + 21452.

It is an arithmetic number, because the mean of its divisors is an integer number (1020816).

Almost surely, 2^7911138 is an apocalyptic number.

7911138 is an abundant number, since it is smaller than the sum of its proper divisors (8421918).

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

7911138 is a wasteful number, since it uses less digits than its factorization.

7911138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42569.

The product of its digits is 1512, while the sum is 30.

The square root of 7911138 is about 2812.6745279182. The cubic root of 7911138 is about 199.2567244626.

The spelling of 7911138 in words is "seven million, nine hundred eleven thousand, one hundred thirty-eight".