18987073 has 8 divisors (see below), whose sum is σ = 21781760. Its totient is φ = 16212960.

The previous prime is 18987053. The next prime is 18987103. The reversal of 18987073 is 37078981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18987073 - 2⁵ = 18987041 is a prime.

It is a super-2 number, since 2×18987073² = 721017882214658, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18987053) 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, 3108 + ... + 6901.

It is an arithmetic number, because the mean of its divisors is an integer number (2722720).

Almost surely, 2^18987073 is an apocalyptic number.

It is an amenable number.

18987073 is a deficient number, since it is larger than the sum of its proper divisors (2794687).

18987073 is a wasteful number, since it uses less digits than its factorization.

18987073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10287.

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 18987073 is about 4357.4158626415. The cubic root of 18987073 is about 266.7796346019.

The spelling of 18987073 in words is "eighteen million, nine hundred eighty-seven thousand, seventy-three".