18901889 has 8 divisors (see below), whose sum is σ = 19320000. Its totient is φ = 18487152.

The previous prime is 18901877. The next prime is 18901891. The reversal of 18901889 is 98810981.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18901889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18901829) 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, 12812 + ... + 14210.

It is an arithmetic number, because the mean of its divisors is an integer number (2415000).

Almost surely, 2^18901889 is an apocalyptic number.

It is an amenable number.

18901889 is a deficient number, since it is larger than the sum of its proper divisors (418111).

18901889 is a wasteful number, since it uses less digits than its factorization.

18901889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1687.

The product of its (nonzero) digits is 41472, while the sum is 44.

The square root of 18901889 is about 4347.6302740689. The cubic root of 18901889 is about 266.3800745693.

The spelling of 18901889 in words is "eighteen million, nine hundred one thousand, eight hundred eighty-nine".