18841147 has 4 divisors (see below), whose sum is σ = 20290480. Its totient is φ = 17391816.

The previous prime is 18841133. The next prime is 18841153. The reversal of 18841147 is 74114881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74114881 = 8609².

It is not a de Polignac number, because 18841147 - 2⁷ = 18841019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18841127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 724647 + ... + 724672.

It is an arithmetic number, because the mean of its divisors is an integer number (5072620).

Almost surely, 2^18841147 is an apocalyptic number.

18841147 is a deficient number, since it is larger than the sum of its proper divisors (1449333).

18841147 is a wasteful number, since it uses less digits than its factorization.

18841147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1449332.

The product of its digits is 7168, while the sum is 34.

The square root of 18841147 is about 4340.6390082567. The cubic root of 18841147 is about 266.0944272513.

The spelling of 18841147 in words is "eighteen million, eight hundred forty-one thousand, one hundred forty-seven".