16865389 has 2 divisors, whose sum is σ = 16865390. Its totient is φ = 16865388.

The previous prime is 16865383. The next prime is 16865393. The reversal of 16865389 is 98356861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16540489 + 324900 = 4067^2 + 570^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16865389 is a prime.

It is a super-2 number, since 2×16865389² = 568882692242642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16865383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8432694 + 8432695.

It is an arithmetic number, because the mean of its divisors is an integer number (8432695).

Almost surely, 2^16865389 is an apocalyptic number.

It is an amenable number.

16865389 is a deficient number, since it is larger than the sum of its proper divisors (1).

16865389 is an equidigital number, since it uses as much as digits as its factorization.

16865389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 46.

The square root of 16865389 is about 4106.7492010105. The cubic root of 16865389 is about 256.4476877056.

The spelling of 16865389 in words is "sixteen million, eight hundred sixty-five thousand, three hundred eighty-nine".