16861387 has 2 divisors, whose sum is σ = 16861388. Its totient is φ = 16861386.

The previous prime is 16861357. The next prime is 16861447. The reversal of 16861387 is 78316861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16861387 - 2⁷ = 16861259 is a prime.

It is not a weakly prime, because it can be changed into another prime (16861357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8430693 + 8430694.

It is an arithmetic number, because the mean of its divisors is an integer number (8430694).

Almost surely, 2^16861387 is an apocalyptic number.

16861387 is a deficient number, since it is larger than the sum of its proper divisors (1).

16861387 is an equidigital number, since it uses as much as digits as its factorization.

16861387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 40.

The square root of 16861387 is about 4106.2619254013. The cubic root of 16861387 is about 256.4274018837.

The spelling of 16861387 in words is "sixteen million, eight hundred sixty-one thousand, three hundred eighty-seven".