18989834 has 4 divisors (see below), whose sum is σ = 28484754. Its totient is φ = 9494916.

The previous prime is 18989827. The next prime is 18989837. The reversal of 18989834 is 43898981.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18464209 + 525625 = 4297^2 + 725^2 .

It is a super-2 number, since 2×18989834² = 721227590695112, which contains 22 as substring.

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 (18989837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4747457 + ... + 4747460.

Almost surely, 2^18989834 is an apocalyptic number.

18989834 is a deficient number, since it is larger than the sum of its proper divisors (9494920).

18989834 is an equidigital number, since it uses as much as digits as its factorization.

18989834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9494919.

The product of its digits is 497664, while the sum is 50.

The square root of 18989834 is about 4357.7326673397. The cubic root of 18989834 is about 266.7925652043.

The spelling of 18989834 in words is "eighteen million, nine hundred eighty-nine thousand, eight hundred thirty-four".