16489999 has 2 divisors, whose sum is σ = 16490000. Its totient is φ = 16489998.

The previous prime is 16489981. The next prime is 16490021. The reversal of 16489999 is 99998461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16489999 - 2¹³ = 16481807 is a prime.

16489999 is a modest number, since divided by 9999 gives 1648 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16489199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8244999 + 8245000.

It is an arithmetic number, because the mean of its divisors is an integer number (8245000).

Almost surely, 2^16489999 is an apocalyptic number.

16489999 is a deficient number, since it is larger than the sum of its proper divisors (1).

16489999 is an equidigital number, since it uses as much as digits as its factorization.

16489999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1259712, while the sum is 55.

The square root of 16489999 is about 4060.7879777206. The cubic root of 16489999 is about 254.5307222032.

The spelling of 16489999 in words is "sixteen million, four hundred eighty-nine thousand, nine hundred ninety-nine".