16487789 has 2 divisors, whose sum is σ = 16487790. Its totient is φ = 16487788.

The previous prime is 16487761. The next prime is 16487819. The reversal of 16487789 is 98778461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15342889 + 1144900 = 3917^2 + 1070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16487789 is a prime.

It is a super-2 number, since 2×16487789² = 543694372217042, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16487749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8243894 + 8243895.

It is an arithmetic number, because the mean of its divisors is an integer number (8243895).

Almost surely, 2^16487789 is an apocalyptic number.

It is an amenable number.

16487789 is a deficient number, since it is larger than the sum of its proper divisors (1).

16487789 is an equidigital number, since it uses as much as digits as its factorization.

16487789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 50.

The square root of 16487789 is about 4060.5158539279. The cubic root of 16487789 is about 254.5193509062.

The spelling of 16487789 in words is "sixteen million, four hundred eighty-seven thousand, seven hundred eighty-nine".