16864825 has 12 divisors (see below), whose sum is σ = 21201148. Its totient is φ = 13305600.

The previous prime is 16864811. The next prime is 16864831. The reversal of 16864825 is 52846861.

It can be written as a sum of positive squares in 6 ways, for example, as 896809 + 15968016 = 947^2 + 3996^2 .

It is not a de Polignac number, because 16864825 - 2¹⁷ = 16733753 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2796 + ... + 6445.

Almost surely, 2^16864825 is an apocalyptic number.

It is an amenable number.

16864825 is a deficient number, since it is larger than the sum of its proper divisors (4336323).

16864825 is an equidigital number, since it uses as much as digits as its factorization.

16864825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9324 (or 9319 counting only the distinct ones).

The product of its digits is 92160, while the sum is 40.

The square root of 16864825 is about 4106.6805329852. The cubic root of 16864825 is about 256.4448290284. Note that the first 3 decimals are identical.

It can be divided in two parts, 16864 and 825, that added together give a square (17689 = 133²).

The spelling of 16864825 in words is "sixteen million, eight hundred sixty-four thousand, eight hundred twenty-five".