18540983 has 4 divisors (see below), whose sum is σ = 18935520. Its totient is φ = 18146448.

The previous prime is 18540971. The next prime is 18540989. The reversal of 18540983 is 38904581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 38904581 = 229 ⋅169889.

It is a cyclic number.

It is not a de Polignac number, because 18540983 - 2¹⁴ = 18524599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18540989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197198 + ... + 197291.

It is an arithmetic number, because the mean of its divisors is an integer number (4733880).

Almost surely, 2^18540983 is an apocalyptic number.

18540983 is a deficient number, since it is larger than the sum of its proper divisors (394537).

18540983 is an equidigital number, since it uses as much as digits as its factorization.

18540983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394536.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 18540983 is about 4305.9241749014. The cubic root of 18540983 is about 264.6737791898.

The spelling of 18540983 in words is "eighteen million, five hundred forty thousand, nine hundred eighty-three".