18249745 has 4 divisors (see below), whose sum is σ = 21899700. Its totient is φ = 14599792.

The previous prime is 18249739. The next prime is 18249779. The reversal of 18249745 is 54794281.

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 14265729 + 3984016 = 3777^2 + 1996^2 .

It is a cyclic number.

It is not a de Polignac number, because 18249745 - 2⁷ = 18249617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18249698 and 18249707.

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, 1824970 + ... + 1824979.

It is an arithmetic number, because the mean of its divisors is an integer number (5474925).

Almost surely, 2^18249745 is an apocalyptic number.

It is an amenable number.

18249745 is a deficient number, since it is larger than the sum of its proper divisors (3649955).

18249745 is an equidigital number, since it uses as much as digits as its factorization.

18249745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3649954.

The product of its digits is 80640, while the sum is 40.

The square root of 18249745 is about 4271.9720270620. The cubic root of 18249745 is about 263.2806451585.

It can be divided in two parts, 18249 and 745, that multiplied together give a triangular number (13595505 = T₅₂₁₄).

The spelling of 18249745 in words is "eighteen million, two hundred forty-nine thousand, seven hundred forty-five".