18734645 has 4 divisors (see below), whose sum is σ = 22481580. Its totient is φ = 14987712.

The previous prime is 18734641. The next prime is 18734657. The reversal of 18734645 is 54643781.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14577124 + 4157521 = 3818^2 + 2039^2 .

It is a cyclic number.

It is not a de Polignac number, because 18734645 - 2² = 18734641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18734599 and 18734608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18734641) 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, 1873460 + ... + 1873469.

It is an arithmetic number, because the mean of its divisors is an integer number (5620395).

Almost surely, 2^18734645 is an apocalyptic number.

It is an amenable number.

18734645 is a deficient number, since it is larger than the sum of its proper divisors (3746935).

18734645 is an equidigital number, since it uses as much as digits as its factorization.

18734645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3746934.

The product of its digits is 80640, while the sum is 38.

The square root of 18734645 is about 4328.3536130959. The cubic root of 18734645 is about 265.5921019465.

The spelling of 18734645 in words is "eighteen million, seven hundred thirty-four thousand, six hundred forty-five".