16343989 has 2 divisors, whose sum is σ = 16343990. Its totient is φ = 16343988.

The previous prime is 16343969. The next prime is 16343993. The reversal of 16343989 is 98934361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9672100 + 6671889 = 3110^2 + 2583^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16343989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16343939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8171994 + 8171995.

It is an arithmetic number, because the mean of its divisors is an integer number (8171995).

Almost surely, 2^16343989 is an apocalyptic number.

It is an amenable number.

16343989 is a deficient number, since it is larger than the sum of its proper divisors (1).

16343989 is an equidigital number, since it uses as much as digits as its factorization.

16343989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 43.

The square root of 16343989 is about 4042.7699662484. The cubic root of 16343989 is about 253.7772501008. Note that the first 3 decimals are identical.

The spelling of 16343989 in words is "sixteen million, three hundred forty-three thousand, nine hundred eighty-nine".