18858745 has 4 divisors (see below), whose sum is σ = 22630500. Its totient is φ = 15086992.

The previous prime is 18858743. The next prime is 18858769. The reversal of 18858745 is 54785881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54785881 = 41 ⋅1336241.

It can be written as a sum of positive squares in 2 ways, for example, as 12467961 + 6390784 = 3531^2 + 2528^2 .

It is a cyclic number.

It is not a de Polignac number, because 18858745 - 2¹ = 18858743 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18858695 and 18858704.

It is not an unprimeable number, because it can be changed into a prime (18858743) 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, 1885870 + ... + 1885879.

It is an arithmetic number, because the mean of its divisors is an integer number (5657625).

Almost surely, 2^18858745 is an apocalyptic number.

It is an amenable number.

18858745 is a deficient number, since it is larger than the sum of its proper divisors (3771755).

18858745 is an equidigital number, since it uses as much as digits as its factorization.

18858745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3771754.

The product of its digits is 358400, while the sum is 46.

The square root of 18858745 is about 4342.6656560228. The cubic root of 18858745 is about 266.1772472723.

The spelling of 18858745 in words is "eighteen million, eight hundred fifty-eight thousand, seven hundred forty-five".