16701985 has 8 divisors (see below), whose sum is σ = 20584296. Its totient is φ = 13000320.

The previous prime is 16701907. The next prime is 16701989. The reversal of 16701985 is 58910761.

It can be written as a sum of positive squares in 4 ways, for example, as 4875264 + 11826721 = 2208^2 + 3439^2 .

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

It is not a de Polignac number, because 16701985 - 2¹³ = 16693793 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (16701989) 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, 44956 + ... + 45325.

It is an arithmetic number, because the mean of its divisors is an integer number (2573037).

Almost surely, 2^16701985 is an apocalyptic number.

It is an amenable number.

16701985 is a deficient number, since it is larger than the sum of its proper divisors (3882311).

16701985 is an equidigital number, since it uses as much as digits as its factorization.

16701985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90323.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 16701985 is about 4086.8062102331. The cubic root of 16701985 is about 255.6167819765.

It can be divided in two parts, 1670 and 1985, that added together give a triangular number (3655 = T₈₅).

The spelling of 16701985 in words is "sixteen million, seven hundred one thousand, nine hundred eighty-five".