16243997 has 8 divisors (see below), whose sum is σ = 20252352. Its totient is φ = 12657600.

The previous prime is 16243979. The next prime is 16244009. The reversal of 16243997 is 79934261.

16243997 is nontrivially palindromic in base 13.

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 16243997 - 2⁶ = 16243933 is a prime.

It is a Duffinian number.

It is a zygodrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16243937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105404 + ... + 105557.

It is an arithmetic number, because the mean of its divisors is an integer number (2531544).

Almost surely, 2^16243997 is an apocalyptic number.

It is an amenable number.

16243997 is a deficient number, since it is larger than the sum of its proper divisors (4008355).

16243997 is a wasteful number, since it uses less digits than its factorization.

16243997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210979.

The product of its digits is 81648, while the sum is 41.

The square root of 16243997 is about 4030.3842248600. The cubic root of 16243997 is about 253.2586573910.

The spelling of 16243997 in words is "sixteen million, two hundred forty-three thousand, nine hundred ninety-seven".