18973982 has 4 divisors (see below), whose sum is σ = 28460976. Its totient is φ = 9486990.

The previous prime is 18973979. The next prime is 18974009. The reversal of 18973982 is 28937981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 28937981 = 701 ⋅41281.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4743494 + ... + 4743497.

It is an arithmetic number, because the mean of its divisors is an integer number (7115244).

Almost surely, 2^18973982 is an apocalyptic number.

18973982 is a deficient number, since it is larger than the sum of its proper divisors (9486994).

18973982 is an equidigital number, since it uses as much as digits as its factorization.

18973982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9486993.

The product of its digits is 217728, while the sum is 47.

The square root of 18973982 is about 4355.9134518491. The cubic root of 18973982 is about 266.7183084014.

The spelling of 18973982 in words is "eighteen million, nine hundred seventy-three thousand, nine hundred eighty-two".