16639423 has 2 divisors, whose sum is σ = 16639424. Its totient is φ = 16639422.

The previous prime is 16639411. The next prime is 16639429. The reversal of 16639423 is 32493661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16639423 - 2⁵ = 16639391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16639429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8319711 + 8319712.

It is an arithmetic number, because the mean of its divisors is an integer number (8319712).

Almost surely, 2^16639423 is an apocalyptic number.

16639423 is a deficient number, since it is larger than the sum of its proper divisors (1).

16639423 is an equidigital number, since it uses as much as digits as its factorization.

16639423 is an odious number, because the sum of its binary digits is odd.

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

The square root of 16639423 is about 4079.1448858799. The cubic root of 16639423 is about 255.2972210349.

The spelling of 16639423 in words is "sixteen million, six hundred thirty-nine thousand, four hundred twenty-three".