16397397 has 28 divisors (see below), whose sum is σ = 24972864. Its totient is φ = 10760040.

The previous prime is 16397389. The next prime is 16397411. The reversal of 16397397 is 79379361.

16397397 is a `hidden beast` number, since 1 + 639 + 7 + 3 + 9 + 7 = 666.

It is not a de Polignac number, because 16397397 - 2³ = 16397389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16393397) 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 27 ways as a sum of consecutive naturals, for example, 60372 + ... + 60642.

It is an arithmetic number, because the mean of its divisors is an integer number (891888).

Almost surely, 2^16397397 is an apocalyptic number.

It is an amenable number.

16397397 is a deficient number, since it is larger than the sum of its proper divisors (8575467).

16397397 is an frugal number, since it uses more digits than its factorization.

16397397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372 (or 357 counting only the distinct ones).

The product of its digits is 214326, while the sum is 45.

The square root of 16397397 is about 4049.3699509924. The cubic root of 16397397 is about 254.0533760561.

The spelling of 16397397 in words is "sixteen million, three hundred ninety-seven thousand, three hundred ninety-seven".