16389791 has 8 divisors (see below), whose sum is σ = 18316368. Its totient is φ = 14536000.

The previous prime is 16389757. The next prime is 16389797. The reversal of 16389791 is 19798361.

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

It is a cyclic number.

It is not a de Polignac number, because 16389791 - 2¹⁴ = 16373407 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 (16389797) 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, 17720 + ... + 18621.

It is an arithmetic number, because the mean of its divisors is an integer number (2289546).

Almost surely, 2^16389791 is an apocalyptic number.

16389791 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16389791 is a deficient number, since it is larger than the sum of its proper divisors (1926577).

16389791 is a wasteful number, since it uses less digits than its factorization.

16389791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36393.

The product of its digits is 81648, while the sum is 44.

The square root of 16389791 is about 4048.4306836106. The cubic root of 16389791 is about 254.0140887467.

The spelling of 16389791 in words is "sixteen million, three hundred eighty-nine thousand, seven hundred ninety-one".