18944247 has 16 divisors (see below), whose sum is σ = 28949760. Its totient is φ = 10794432.

The previous prime is 18944231. The next prime is 18944257. The reversal of 18944247 is 74244981.

It is not a de Polignac number, because 18944247 - 2⁴ = 18944231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18944207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7723 + ... + 9875.

It is an arithmetic number, because the mean of its divisors is an integer number (1809360).

Almost surely, 2^18944247 is an apocalyptic number.

18944247 is a deficient number, since it is larger than the sum of its proper divisors (10005513).

18944247 is a wasteful number, since it uses less digits than its factorization.

18944247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2582.

The product of its digits is 64512, while the sum is 39.

The square root of 18944247 is about 4352.4989373922. The cubic root of 18944247 is about 266.5789067117.

It can be divided in two parts, 1894424 and 7, that added together give a triangular number (1894431 = T₁₉₄₆).

The spelling of 18944247 in words is "eighteen million, nine hundred forty-four thousand, two hundred forty-seven".