1984865 has 8 divisors (see below), whose sum is σ = 2446440. Its totient is φ = 1544832.

The previous prime is 1984859. The next prime is 1984867. The reversal of 1984865 is 5684891.

It can be written as a sum of positive squares in 4 ways, for example, as 781456 + 1203409 = 884^2 + 1097^2 .

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 1984865 - 2⁴ = 1984849 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1984867) 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, 5180 + ... + 5549.

It is an arithmetic number, because the mean of its divisors is an integer number (305805).

2^1984865 is an apocalyptic number.

It is an amenable number.

1984865 is a deficient number, since it is larger than the sum of its proper divisors (461575).

1984865 is a wasteful number, since it uses less digits than its factorization.

1984865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10771.

The product of its digits is 69120, while the sum is 41.

The square root of 1984865 is about 1408.8523698387. The cubic root of 1984865 is about 125.6734848286.

The spelling of 1984865 in words is "one million, nine hundred eighty-four thousand, eight hundred sixty-five".