18899245 has 4 divisors (see below), whose sum is σ = 22679100. Its totient is φ = 15119392.

The previous prime is 18899233. The next prime is 18899263. The reversal of 18899245 is 54299881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54299881 = 317 ⋅171293.

It can be written as a sum of positive squares in 2 ways, for example, as 2399401 + 16499844 = 1549^2 + 4062^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18899245 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18899195 and 18899204.

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, 1889920 + ... + 1889929.

It is an arithmetic number, because the mean of its divisors is an integer number (5669775).

Almost surely, 2^18899245 is an apocalyptic number.

It is an amenable number.

18899245 is a deficient number, since it is larger than the sum of its proper divisors (3779855).

18899245 is an equidigital number, since it uses as much as digits as its factorization.

18899245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3779854.

The product of its digits is 207360, while the sum is 46.

The square root of 18899245 is about 4347.3261897401. The cubic root of 18899245 is about 266.3676535574.

The spelling of 18899245 in words is "eighteen million, eight hundred ninety-nine thousand, two hundred forty-five".