7138836 has 18 divisors (see below), whose sum is σ = 18045482. Its totient is φ = 2379600.

The previous prime is 7138829. The next prime is 7138841. The reversal of 7138836 is 6388317.

7138836 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 only one way, i.e., 3920400 + 3218436 = 1980^2 + 1794^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 198301 = 7138836 / (7 + 1 + 3 + 8 + 8 + 3 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 7138836.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 99115 + ... + 99186.

Almost surely, 2^7138836 is an apocalyptic number.

It is an amenable number.

7138836 is an abundant number, since it is smaller than the sum of its proper divisors (10906646).

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

7138836 is a wasteful number, since it uses less digits than its factorization.

7138836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198311 (or 198306 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 7138836 is about 2671.8600262738. The cubic root of 7138836 is about 192.5495324271.

The spelling of 7138836 in words is "seven million, one hundred thirty-eight thousand, eight hundred thirty-six".