7218194 has 4 divisors (see below), whose sum is σ = 10827294. Its totient is φ = 3609096.

The previous prime is 7218193. The next prime is 7218199. The reversal of 7218194 is 4918127.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 6692569 + 525625 = 2587^2 + 725^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 7218194.

It is not an unprimeable number, because it can be changed into a prime (7218193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1804547 + ... + 1804550.

Almost surely, 2^7218194 is an apocalyptic number.

7218194 is a deficient number, since it is larger than the sum of its proper divisors (3609100).

7218194 is a wasteful number, since it uses less digits than its factorization.

7218194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3609099.

The product of its digits is 4032, while the sum is 32.

The square root of 7218194 is about 2686.6696856890. The cubic root of 7218194 is about 193.2603893137.

The spelling of 7218194 in words is "seven million, two hundred eighteen thousand, one hundred ninety-four".