16439999 has 2 divisors, whose sum is σ = 16440000. Its totient is φ = 16439998.

The previous prime is 16439993. The next prime is 16440007. The reversal of 16439999 is 99993461.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (99993461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16439999 - 2⁸ = 16439743 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

16439999 is a modest number, since divided by 9999 gives 1643 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16439993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8219999 + 8220000.

It is an arithmetic number, because the mean of its divisors is an integer number (8220000).

Almost surely, 2^16439999 is an apocalyptic number.

16439999 is a deficient number, since it is larger than the sum of its proper divisors (1).

16439999 is an equidigital number, since it uses as much as digits as its factorization.

16439999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 472392, while the sum is 50.

The square root of 16439999 is about 4054.6268632268. The cubic root of 16439999 is about 254.2732040815.

The spelling of 16439999 in words is "sixteen million, four hundred thirty-nine thousand, nine hundred ninety-nine".