16861587 has 4 divisors (see below), whose sum is σ = 22482120. Its totient is φ = 11241056.

The previous prime is 16861583. The next prime is 16861589. The reversal of 16861587 is 78516861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16861587 - 2² = 16861583 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16861583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2810262 + ... + 2810267.

It is an arithmetic number, because the mean of its divisors is an integer number (5620530).

Almost surely, 2^16861587 is an apocalyptic number.

16861587 is a deficient number, since it is larger than the sum of its proper divisors (5620533).

16861587 is an equidigital number, since it uses as much as digits as its factorization.

16861587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5620532.

The product of its digits is 80640, while the sum is 42.

The square root of 16861587 is about 4106.2862783786. The cubic root of 16861587 is about 256.4284157441.

The spelling of 16861587 in words is "sixteen million, eight hundred sixty-one thousand, five hundred eighty-seven".