16893997 has 4 divisors (see below), whose sum is σ = 16987516. Its totient is φ = 16800480.

The previous prime is 16893991. The next prime is 16894013. The reversal of 16893997 is 79939861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2499561 + 14394436 = 1581^2 + 3794^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16893997 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 (16893991) 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, 46488 + ... + 46849.

It is an arithmetic number, because the mean of its divisors is an integer number (4246879).

Almost surely, 2^16893997 is an apocalyptic number.

It is an amenable number.

16893997 is a deficient number, since it is larger than the sum of its proper divisors (93519).

16893997 is an equidigital number, since it uses as much as digits as its factorization.

16893997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93518.

The product of its digits is 734832, while the sum is 52.

The square root of 16893997 is about 4110.2307721100. The cubic root of 16893997 is about 256.5926060190.

The spelling of 16893997 in words is "sixteen million, eight hundred ninety-three thousand, nine hundred ninety-seven".