16989493 has 4 divisors (see below), whose sum is σ = 17028288. Its totient is φ = 16950700.

The previous prime is 16989491. The next prime is 16989523. The reversal of 16989493 is 39498961.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16989493 - 2¹ = 16989491 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16989491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18733 + ... + 19618.

It is an arithmetic number, because the mean of its divisors is an integer number (4257072).

Almost surely, 2^16989493 is an apocalyptic number.

It is an amenable number.

16989493 is a deficient number, since it is larger than the sum of its proper divisors (38795).

16989493 is an equidigital number, since it uses as much as digits as its factorization.

16989493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38794.

The product of its digits is 419904, while the sum is 49.

The square root of 16989493 is about 4121.8312677741. The cubic root of 16989493 is about 257.0751747060.

The spelling of 16989493 in words is "sixteen million, nine hundred eighty-nine thousand, four hundred ninety-three".