16997997 has 8 divisors (see below), whose sum is σ = 22888800. Its totient is φ = 11219600.

The previous prime is 16997993. The next prime is 16997999. The reversal of 16997997 is 79979961.

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 16997997 - 2² = 16997993 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16997993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27747 + ... + 28352.

It is an arithmetic number, because the mean of its divisors is an integer number (2861100).

Almost surely, 2^16997997 is an apocalyptic number.

It is an amenable number.

16997997 is a deficient number, since it is larger than the sum of its proper divisors (5890803).

16997997 is a wasteful number, since it uses less digits than its factorization.

16997997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56203.

The product of its digits is 1928934, while the sum is 57.

The square root of 16997997 is about 4122.8627190339. The cubic root of 16997997 is about 257.1180600868.

The spelling of 16997997 in words is "sixteen million, nine hundred ninety-seven thousand, nine hundred ninety-seven".