18999982 has 16 divisors (see below), whose sum is σ = 30404160. Its totient is φ = 8873728.

The previous prime is 18999979. The next prime is 18999989. The reversal of 18999982 is 28999981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18999989) 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 7 ways as a sum of consecutive naturals, for example, 2619 + ... + 6697.

It is an arithmetic number, because the mean of its divisors is an integer number (1900260).

Almost surely, 2^18999982 is an apocalyptic number.

18999982 is a deficient number, since it is larger than the sum of its proper divisors (11404178).

18999982 is a wasteful number, since it uses less digits than its factorization.

18999982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4235.

The product of its digits is 839808, while the sum is 55.

The square root of 18999982 is about 4358.8968787986. The cubic root of 18999982 is about 266.8400806069.

Subtracting 18999982 from its reverse (28999981), we obtain a palindrome (9999999).

It can be divided in two parts, 1899 and 9982, that added together give a square (11881 = 109²).

The spelling of 18999982 in words is "eighteen million, nine hundred ninety-nine thousand, nine hundred eighty-two".