16397197 has 8 divisors (see below), whose sum is σ = 17523000. Its totient is φ = 15289344.

The previous prime is 16397191. The next prime is 16397207. The reversal of 16397197 is 79179361.

It can be written as a sum of positive squares in 4 ways, for example, as 1179396 + 15217801 = 1086^2 + 3901^2 .

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 16397197 - 2³ = 16397189 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 (16397191) 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, 2572 + ... + 6277.

It is an arithmetic number, because the mean of its divisors is an integer number (2190375).

Almost surely, 2^16397197 is an apocalyptic number.

16397197 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

16397197 is a deficient number, since it is larger than the sum of its proper divisors (1125803).

16397197 is a wasteful number, since it uses less digits than its factorization.

16397197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8975.

The product of its digits is 71442, while the sum is 43.

The square root of 16397197 is about 4049.3452557173. The cubic root of 16397197 is about 254.0523431507.

It can be divided in two parts, 1639 and 7197, that added together give a square (8836 = 94²).

The spelling of 16397197 in words is "sixteen million, three hundred ninety-seven thousand, one hundred ninety-seven".