16538789 has 4 divisors (see below), whose sum is σ = 16923456. Its totient is φ = 16154124.

The previous prime is 16538737. The next prime is 16538801. The reversal of 16538789 is 98783561.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-16538789 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16531789) 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, 192269 + ... + 192354.

It is an arithmetic number, because the mean of its divisors is an integer number (4230864).

Almost surely, 2^16538789 is an apocalyptic number.

It is an amenable number.

16538789 is a deficient number, since it is larger than the sum of its proper divisors (384667).

16538789 is an equidigital number, since it uses as much as digits as its factorization.

16538789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384666.

The product of its digits is 362880, while the sum is 47.

The square root of 16538789 is about 4066.7909953672. The cubic root of 16538789 is about 254.7815070612.

The spelling of 16538789 in words is "sixteen million, five hundred thirty-eight thousand, seven hundred eighty-nine".