16640213 has 4 divisors (see below), whose sum is σ = 16701888. Its totient is φ = 16578540.

The previous prime is 16640207. The next prime is 16640227. The reversal of 16640213 is 31204661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16640213 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 (16640233) 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, 30431 + ... + 30972.

It is an arithmetic number, because the mean of its divisors is an integer number (4175472).

Almost surely, 2^16640213 is an apocalyptic number.

It is an amenable number.

16640213 is a deficient number, since it is larger than the sum of its proper divisors (61675).

16640213 is an equidigital number, since it uses as much as digits as its factorization.

16640213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61674.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 16640213 is about 4079.2417187512. The cubic root of 16640213 is about 255.3012612714.

Adding to 16640213 its reverse (31204661), we get a palindrome (47844874).

The spelling of 16640213 in words is "sixteen million, six hundred forty thousand, two hundred thirteen".