16172789 has 4 divisors (see below), whose sum is σ = 16289280. Its totient is φ = 16056300.

The previous prime is 16172777. The next prime is 16172803. The reversal of 16172789 is 98727161.

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, and also an emirpimes, since its reverse is a distinct semiprime: 98727161 = 13 ⋅7594397.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16172789 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 (16172759) 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, 58037 + ... + 58314.

It is an arithmetic number, because the mean of its divisors is an integer number (4072320).

Almost surely, 2^16172789 is an apocalyptic number.

It is an amenable number.

16172789 is a deficient number, since it is larger than the sum of its proper divisors (116491).

16172789 is a wasteful number, since it uses less digits than its factorization.

16172789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116490.

The product of its digits is 42336, while the sum is 41.

The square root of 16172789 is about 4021.5406251833. The cubic root of 16172789 is about 252.8880495395. Note that the first 3 decimals are identical.

It can be divided in two parts, 16172 and 789, that added together give a palindrome (16961).

The spelling of 16172789 in words is "sixteen million, one hundred seventy-two thousand, seven hundred eighty-nine".