16643397 has 8 divisors (see below), whose sum is σ = 22212000. Its totient is φ = 11085200.

The previous prime is 16643383. The next prime is 16643399. The reversal of 16643397 is 79334661.

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 16643397 - 2⁴ = 16643381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16643399) 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, 2647 + ... + 6347.

It is an arithmetic number, because the mean of its divisors is an integer number (2776500).

Almost surely, 2^16643397 is an apocalyptic number.

It is an amenable number.

16643397 is a deficient number, since it is larger than the sum of its proper divisors (5568603).

16643397 is a wasteful number, since it uses less digits than its factorization.

16643397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5203.

The product of its digits is 81648, while the sum is 39.

The square root of 16643397 is about 4079.6319686952. The cubic root of 16643397 is about 255.3175436626.

The spelling of 16643397 in words is "sixteen million, six hundred forty-three thousand, three hundred ninety-seven".