16644739 has 2 divisors, whose sum is σ = 16644740. Its totient is φ = 16644738.

The previous prime is 16644731. The next prime is 16644757. The reversal of 16644739 is 93744661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16644739 - 2³ = 16644731 is a prime.

It is not a weakly prime, because it can be changed into another prime (16644731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8322369 + 8322370.

It is an arithmetic number, because the mean of its divisors is an integer number (8322370).

Almost surely, 2^16644739 is an apocalyptic number.

16644739 is a deficient number, since it is larger than the sum of its proper divisors (1).

16644739 is an equidigital number, since it uses as much as digits as its factorization.

16644739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 40.

The square root of 16644739 is about 4079.7964410005. The cubic root of 16644739 is about 255.3244057821.

The spelling of 16644739 in words is "sixteen million, six hundred forty-four thousand, seven hundred thirty-nine".