16861189 has 8 divisors (see below), whose sum is σ = 17820000. Its totient is φ = 15909552.

The previous prime is 16861183. The next prime is 16861213. The reversal of 16861189 is 98116861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16861189 - 2³ = 16861181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16861181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3462 + ... + 6760.

It is an arithmetic number, because the mean of its divisors is an integer number (2227500).

Almost surely, 2^16861189 is an apocalyptic number.

16861189 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

16861189 is a deficient number, since it is larger than the sum of its proper divisors (958811).

16861189 is a wasteful number, since it uses less digits than its factorization.

16861189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3587.

The product of its digits is 20736, while the sum is 40.

The square root of 16861189 is about 4106.2378158115. The cubic root of 16861189 is about 256.4263981540.

The spelling of 16861189 in words is "sixteen million, eight hundred sixty-one thousand, one hundred eighty-nine".