18222523 has 4 divisors (see below), whose sum is σ = 19879128. Its totient is φ = 16565920.

The previous prime is 18222473. The next prime is 18222541. The reversal of 18222523 is 32522281.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18222523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18222553) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 828286 + ... + 828307.

It is an arithmetic number, because the mean of its divisors is an integer number (4969782).

Almost surely, 2^18222523 is an apocalyptic number.

18222523 is a deficient number, since it is larger than the sum of its proper divisors (1656605).

18222523 is a wasteful number, since it uses less digits than its factorization.

18222523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1656604.

The product of its digits is 1920, while the sum is 25.

The square root of 18222523 is about 4268.7847216743. The cubic root of 18222523 is about 263.1496736077.

The spelling of 18222523 in words is "eighteen million, two hundred twenty-two thousand, five hundred twenty-three".