18427849 has 4 divisors (see below), whose sum is σ = 20103120. Its totient is φ = 16752580.

The previous prime is 18427831. The next prime is 18427879. The reversal of 18427849 is 94872481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94872481 = 11 ⋅8624771.

It is a cyclic number.

It is not a de Polignac number, because 18427849 - 2¹³ = 18419657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18427879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 837619 + ... + 837640.

It is an arithmetic number, because the mean of its divisors is an integer number (5025780).

Almost surely, 2^18427849 is an apocalyptic number.

It is an amenable number.

18427849 is a deficient number, since it is larger than the sum of its proper divisors (1675271).

18427849 is a wasteful number, since it uses less digits than its factorization.

18427849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1675270.

The product of its digits is 129024, while the sum is 43.

The square root of 18427849 is about 4292.7670563402. The cubic root of 18427849 is about 264.1343487063.

The spelling of 18427849 in words is "eighteen million, four hundred twenty-seven thousand, eight hundred forty-nine".