18630445 has 4 divisors (see below), whose sum is σ = 22356540. Its totient is φ = 14904352.

The previous prime is 18630397. The next prime is 18630449. The reversal of 18630445 is 54403681.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54403681 = 29 ⋅1875989.

It can be written as a sum of positive squares in 2 ways, for example, as 3279721 + 15350724 = 1811^2 + 3918^2 .

It is a cyclic number.

It is not a de Polignac number, because 18630445 - 2¹¹ = 18628397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18630449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1863040 + ... + 1863049.

It is an arithmetic number, because the mean of its divisors is an integer number (5589135).

Almost surely, 2^18630445 is an apocalyptic number.

It is an amenable number.

18630445 is a deficient number, since it is larger than the sum of its proper divisors (3726095).

18630445 is an equidigital number, since it uses as much as digits as its factorization.

18630445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3726094.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 18630445 is about 4316.2999200704. The cubic root of 18630445 is about 265.0987883732.

The spelling of 18630445 in words is "eighteen million, six hundred thirty thousand, four hundred forty-five".