18856445 has 4 divisors (see below), whose sum is σ = 22627740. Its totient is φ = 15085152.

The previous prime is 18856391. The next prime is 18856469. The reversal of 18856445 is 54465881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54465881 = 167 ⋅326143.

It can be written as a sum of positive squares in 2 ways, for example, as 6543364 + 12313081 = 2558^2 + 3509^2 .

It is a cyclic number.

It is not a de Polignac number, because 18856445 - 2²⁰ = 17807869 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1885640 + ... + 1885649.

It is an arithmetic number, because the mean of its divisors is an integer number (5656935).

Almost surely, 2^18856445 is an apocalyptic number.

It is an amenable number.

18856445 is a deficient number, since it is larger than the sum of its proper divisors (3771295).

18856445 is an equidigital number, since it uses as much as digits as its factorization.

18856445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3771294.

The product of its digits is 153600, while the sum is 41.

The square root of 18856445 is about 4342.4008336403. The cubic root of 18856445 is about 266.1664258990.

The spelling of 18856445 in words is "eighteen million, eight hundred fifty-six thousand, four hundred forty-five".