18842311 has 4 divisors (see below), whose sum is σ = 18958072. Its totient is φ = 18726552.

The previous prime is 18842309. The next prime is 18842321. The reversal of 18842311 is 11324881.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18842311 - 2¹ = 18842309 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18842311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18842321) 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, 57636 + ... + 57961.

It is an arithmetic number, because the mean of its divisors is an integer number (4739518).

Almost surely, 2^18842311 is an apocalyptic number.

18842311 is a deficient number, since it is larger than the sum of its proper divisors (115761).

18842311 is a wasteful number, since it uses less digits than its factorization.

18842311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115760.

The product of its digits is 1536, while the sum is 28.

The square root of 18842311 is about 4340.7730878266. The cubic root of 18842311 is about 266.0999068812.

The spelling of 18842311 in words is "eighteen million, eight hundred forty-two thousand, three hundred eleven".