16861005 has 24 divisors (see below), whose sum is σ = 33401472. Its totient is φ = 7707744.

The previous prime is 16861003. The next prime is 16861021. The reversal of 16861005 is 50016861.

It is not a de Polignac number, because 16861005 - 2¹ = 16861003 is a prime.

It is a super-2 number, since 2×16861005² = 568586979220050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16861005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16861003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26449 + ... + 27078.

It is an arithmetic number, because the mean of its divisors is an integer number (1391728).

Almost surely, 2^16861005 is an apocalyptic number.

16861005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16861005 is a deficient number, since it is larger than the sum of its proper divisors (16540467).

16861005 is a wasteful number, since it uses less digits than its factorization.

16861005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53545 (or 53542 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 16861005 is about 4106.2154108132. The cubic root of 16861005 is about 256.4254653880.

Adding to 16861005 its reverse (50016861), we get a palindrome (66877866).

The spelling of 16861005 in words is "sixteen million, eight hundred sixty-one thousand, five".