18989537 has 8 divisors (see below), whose sum is σ = 21895296. Its totient is φ = 16132032.

The previous prime is 18989533. The next prime is 18989539. The reversal of 18989537 is 73598981.

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

It is not a de Polignac number, because 18989537 - 2² = 18989533 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18989533) 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, 11213 + ... + 12794.

It is an arithmetic number, because the mean of its divisors is an integer number (2736912).

Almost surely, 2^18989537 is an apocalyptic number.

It is an amenable number.

18989537 is a deficient number, since it is larger than the sum of its proper divisors (2905759).

18989537 is a wasteful number, since it uses less digits than its factorization.

18989537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24127.

The product of its digits is 544320, while the sum is 50.

The square root of 18989537 is about 4357.6985898522. The cubic root of 18989537 is about 266.7911743231.

The spelling of 18989537 in words is "eighteen million, nine hundred eighty-nine thousand, five hundred thirty-seven".