16227989 has 2 divisors, whose sum is σ = 16227990. Its totient is φ = 16227988.

The previous prime is 16227977. The next prime is 16228001. The reversal of 16227989 is 98972261.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (16227977) and next prime (16228001).

It can be written as a sum of positive squares in only one way, i.e., 8151025 + 8076964 = 2855^2 + 2842^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16227989 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16227089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8113994 + 8113995.

It is an arithmetic number, because the mean of its divisors is an integer number (8113995).

Almost surely, 2^16227989 is an apocalyptic number.

It is an amenable number.

16227989 is a deficient number, since it is larger than the sum of its proper divisors (1).

16227989 is an equidigital number, since it uses as much as digits as its factorization.

16227989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 44.

The square root of 16227989 is about 4028.3978204740. The cubic root of 16227989 is about 253.1754369646.

The spelling of 16227989 in words is "sixteen million, two hundred twenty-seven thousand, nine hundred eighty-nine".