16986905 has 8 divisors (see below), whose sum is σ = 21952392. Its totient is φ = 12544128.

The previous prime is 16986889. The next prime is 16986911. The reversal of 16986905 is 50968961.

It can be written as a sum of positive squares in 4 ways, for example, as 234256 + 16752649 = 484^2 + 4093^2 .

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 16986905 - 2⁴ = 16986889 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130604 + ... + 130733.

It is an arithmetic number, because the mean of its divisors is an integer number (2744049).

Almost surely, 2^16986905 is an apocalyptic number.

It is an amenable number.

16986905 is a deficient number, since it is larger than the sum of its proper divisors (4965487).

16986905 is a wasteful number, since it uses less digits than its factorization.

16986905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261355.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 16986905 is about 4121.5173176877. The cubic root of 16986905 is about 257.0621206705.

The spelling of 16986905 in words is "sixteen million, nine hundred eighty-six thousand, nine hundred five".