18019983 has 8 divisors (see below), whose sum is σ = 25440048. Its totient is φ = 11306624.

The previous prime is 18019943. The next prime is 18019993. The reversal of 18019983 is 38991081.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18019983 - 2¹² = 18015887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18019913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176616 + ... + 176717.

It is an arithmetic number, because the mean of its divisors is an integer number (3180006).

Almost surely, 2^18019983 is an apocalyptic number.

18019983 is a deficient number, since it is larger than the sum of its proper divisors (7420065).

18019983 is a wasteful number, since it uses less digits than its factorization.

18019983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353353.

The product of its (nonzero) digits is 15552, while the sum is 39.

The square root of 18019983 is about 4244.9950530007. The cubic root of 18019983 is about 262.1710855455.

The spelling of 18019983 in words is "eighteen million, nineteen thousand, nine hundred eighty-three".