16789997 has 6 divisors (see below), whose sum is σ = 19531278. Its totient is φ = 14391384.

The previous prime is 16789991. The next prime is 16790017. The reversal of 16789997 is 79998761.

It can be written as a sum of positive squares in only one way, i.e., 13920361 + 2869636 = 3731^2 + 1694^2 .

It is not a de Polignac number, because 16789997 - 2⁶ = 16789933 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 (16789991) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 171278 + ... + 171375.

It is an arithmetic number, because the mean of its divisors is an integer number (3255213).

Almost surely, 2^16789997 is an apocalyptic number.

It is an amenable number.

16789997 is a deficient number, since it is larger than the sum of its proper divisors (2741281).

16789997 is an equidigital number, since it uses as much as digits as its factorization.

16789997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342667 (or 342660 counting only the distinct ones).

The product of its digits is 1714608, while the sum is 56.

The square root of 16789997 is about 4097.5598836381. The cubic root of 16789997 is about 256.0649910269.

The spelling of 16789997 in words is "sixteen million, seven hundred eighty-nine thousand, nine hundred ninety-seven".