18969245 has 4 divisors (see below), whose sum is σ = 22763100. Its totient is φ = 15175392.

The previous prime is 18969233. The next prime is 18969253. The reversal of 18969245 is 54296981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54296981 = 1163 ⋅46687.

It can be written as a sum of positive squares in 2 ways, for example, as 8282884 + 10686361 = 2878^2 + 3269^2 .

It is a cyclic number.

It is not a de Polignac number, because 18969245 - 2¹⁰ = 18968221 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18969196 and 18969205.

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, 1896920 + ... + 1896929.

It is an arithmetic number, because the mean of its divisors is an integer number (5690775).

Almost surely, 2^18969245 is an apocalyptic number.

It is an amenable number.

18969245 is a deficient number, since it is larger than the sum of its proper divisors (3793855).

18969245 is an equidigital number, since it uses as much as digits as its factorization.

18969245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3793854.

The product of its digits is 155520, while the sum is 44.

The square root of 18969245 is about 4355.3696743216. The cubic root of 18969245 is about 266.6961104641.

The spelling of 18969245 in words is "eighteen million, nine hundred sixty-nine thousand, two hundred forty-five".