18981074 has 16 divisors (see below), whose sum is σ = 33419328. Its totient is φ = 7914672.

The previous prime is 18981047. The next prime is 18981077. The reversal of 18981074 is 47018981.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (18981077) 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, 17804 + ... + 18839.

It is an arithmetic number, because the mean of its divisors is an integer number (2088708).

Almost surely, 2^18981074 is an apocalyptic number.

18981074 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18981074 is a deficient number, since it is larger than the sum of its proper divisors (14438254).

18981074 is a wasteful number, since it uses less digits than its factorization.

18981074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36689.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 18981074 is about 4356.7274415552. The cubic root of 18981074 is about 266.7515351399.

The spelling of 18981074 in words is "eighteen million, nine hundred eighty-one thousand, seventy-four".