18981514 has 16 divisors (see below), whose sum is σ = 29351808. Its totient is φ = 9201472.

The previous prime is 18981511. The next prime is 18981559. The reversal of 18981514 is 41518981.

It is not an unprimeable number, because it can be changed into a prime (18981511) 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, 9729 + ... + 11515.

It is an arithmetic number, because the mean of its divisors is an integer number (1834488).

Almost surely, 2^18981514 is an apocalyptic number.

18981514 is a deficient number, since it is larger than the sum of its proper divisors (10370294).

18981514 is a wasteful number, since it uses less digits than its factorization.

18981514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1949.

The product of its digits is 11520, while the sum is 37.

The square root of 18981514 is about 4356.7779378802. Note that the first 3 decimals coincide. The cubic root of 18981514 is about 266.7535963118.

The spelling of 18981514 in words is "eighteen million, nine hundred eighty-one thousand, five hundred fourteen".