1864985 has 16 divisors (see below), whose sum is σ = 2437776. Its totient is φ = 1363968.

The previous prime is 1864979. The next prime is 1864987. The reversal of 1864985 is 5894681.

It can be written as a sum of positive squares in 8 ways, for example, as 234256 + 1630729 = 484^2 + 1277^2 .

It is not a de Polignac number, because 1864985 - 2⁶ = 1864921 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1864987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2849 + ... + 3441.

It is an arithmetic number, because the mean of its divisors is an integer number (152361).

2^1864985 is an apocalyptic number.

It is an amenable number.

1864985 is a deficient number, since it is larger than the sum of its proper divisors (572791).

1864985 is a wasteful number, since it uses less digits than its factorization.

1864985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652.

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

The square root of 1864985 is about 1365.6445364735. The cubic root of 1864985 is about 123.0906639807.

The spelling of 1864985 in words is "one million, eight hundred sixty-four thousand, nine hundred eighty-five".