16865869 has 2 divisors, whose sum is σ = 16865870. Its totient is φ = 16865868.

The previous prime is 16865867. The next prime is 16865881. The reversal of 16865869 is 96856861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16499844 + 366025 = 4062^2 + 605^2 .

It is a cyclic number.

It is not a de Polignac number, because 16865869 - 2¹ = 16865867 is a prime.

It is a super-2 number, since 2×16865869² = 568915074250322, which contains 22 as substring.

Together with 16865867, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16865867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8432934 + 8432935.

It is an arithmetic number, because the mean of its divisors is an integer number (8432935).

Almost surely, 2^16865869 is an apocalyptic number.

It is an amenable number.

16865869 is a deficient number, since it is larger than the sum of its proper divisors (1).

16865869 is an equidigital number, since it uses as much as digits as its factorization.

16865869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 49.

The square root of 16865869 is about 4106.8076409786. The cubic root of 16865869 is about 256.4501205722.

The spelling of 16865869 in words is "sixteen million, eight hundred sixty-five thousand, eight hundred sixty-nine".