18989011 has 8 divisors (see below), whose sum is σ = 19318544. Its totient is φ = 18662400.

The previous prime is 18988967. The next prime is 18989023. The reversal of 18989011 is 11098981.

It is a happy number.

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

It is a 10-Lehmer number, since φ(18989011) divides (18989011-1)¹⁰.

It is a cyclic number.

It is not a de Polignac number, because 18989011 - 2⁷ = 18988883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18989041) 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, 15211 + ... + 16411.

It is an arithmetic number, because the mean of its divisors is an integer number (2414818).

Almost surely, 2^18989011 is an apocalyptic number.

18989011 is a deficient number, since it is larger than the sum of its proper divisors (329533).

18989011 is a wasteful number, since it uses less digits than its factorization.

18989011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1461.

The product of its (nonzero) digits is 5184, while the sum is 37.

The square root of 18989011 is about 4357.6382364763. The cubic root of 18989011 is about 266.7887109762.

The spelling of 18989011 in words is "eighteen million, nine hundred eighty-nine thousand, eleven".