16642393 has 4 divisors (see below), whose sum is σ = 16652340. Its totient is φ = 16632448.

The previous prime is 16642391. The next prime is 16642397. The reversal of 16642393 is 39324661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1338649 + 15303744 = 1157^2 + 3912^2 .

It is a cyclic number.

It is not a de Polignac number, because 16642393 - 2¹ = 16642391 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16642391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1780 + ... + 6037.

It is an arithmetic number, because the mean of its divisors is an integer number (4163085).

Almost surely, 2^16642393 is an apocalyptic number.

It is an amenable number.

16642393 is a deficient number, since it is larger than the sum of its proper divisors (9947).

16642393 is an equidigital number, since it uses as much as digits as its factorization.

16642393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9946.

The product of its digits is 23328, while the sum is 34.

The square root of 16642393 is about 4079.5089165241. The cubic root of 16642393 is about 255.3124096152.

The spelling of 16642393 in words is "sixteen million, six hundred forty-two thousand, three hundred ninety-three".