18706522 has 4 divisors (see below), whose sum is σ = 28059786. Its totient is φ = 9353260.

The previous prime is 18706463. The next prime is 18706549. The reversal of 18706522 is 22560781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22560781 = 571 ⋅39511.

It can be written as a sum of positive squares in only one way, i.e., 18584721 + 121801 = 4311^2 + 349^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4676629 + ... + 4676632.

Almost surely, 2^18706522 is an apocalyptic number.

18706522 is a deficient number, since it is larger than the sum of its proper divisors (9353264).

18706522 is an equidigital number, since it uses as much as digits as its factorization.

18706522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9353263.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 18706522 is about 4325.1036981788. The cubic root of 18706522 is about 265.4591399533.

The spelling of 18706522 in words is "eighteen million, seven hundred six thousand, five hundred twenty-two".