16861889 has 4 divisors (see below), whose sum is σ = 18394800. Its totient is φ = 15328980.

The previous prime is 16861879. The next prime is 16861919. The reversal of 16861889 is 98816861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16861889 - 2¹² = 16857793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16861879) 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, 766439 + ... + 766460.

It is an arithmetic number, because the mean of its divisors is an integer number (4598700).

Almost surely, 2^16861889 is an apocalyptic number.

It is an amenable number.

16861889 is a deficient number, since it is larger than the sum of its proper divisors (1532911).

16861889 is a wasteful number, since it uses less digits than its factorization.

16861889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1532910.

The product of its digits is 165888, while the sum is 47.

The square root of 16861889 is about 4106.3230511006. The cubic root of 16861889 is about 256.4299466581.

The spelling of 16861889 in words is "sixteen million, eight hundred sixty-one thousand, eight hundred eighty-nine".