16649839 has 2 divisors, whose sum is σ = 16649840. Its totient is φ = 16649838.

The previous prime is 16649807. The next prime is 16649879. The reversal of 16649839 is 93894661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16649839 - 2⁵ = 16649807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16649879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8324919 + 8324920.

It is an arithmetic number, because the mean of its divisors is an integer number (8324920).

Almost surely, 2^16649839 is an apocalyptic number.

16649839 is a deficient number, since it is larger than the sum of its proper divisors (1).

16649839 is an equidigital number, since it uses as much as digits as its factorization.

16649839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 46.

The square root of 16649839 is about 4080.4214243139. The cubic root of 16649839 is about 255.3504805175.

It can be divided in two parts, 166 and 49839, that added together give a palindrome (50005).

The spelling of 16649839 in words is "sixteen million, six hundred forty-nine thousand, eight hundred thirty-nine".