1860865 has 4 divisors (see below), whose sum is σ = 2233044. Its totient is φ = 1488688.

The previous prime is 1860857. The next prime is 1860869. The reversal of 1860865 is 5680681.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 263169 + 1597696 = 513^2 + 1264^2 .

It is a cyclic number.

It is not a de Polignac number, because 1860865 - 2³ = 1860857 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 1860865.

It is not an unprimeable number, because it can be changed into a prime (1860869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 186082 + ... + 186091.

It is an arithmetic number, because the mean of its divisors is an integer number (558261).

2^1860865 is an apocalyptic number.

It is an amenable number.

1860865 is a deficient number, since it is larger than the sum of its proper divisors (372179).

1860865 is an equidigital number, since it uses as much as digits as its factorization.

1860865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372178.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 1860865 is about 1364.1352572234. The cubic root of 1860865 is about 122.9999559345. Note that the first 4 decimals are identical.

The spelling of 1860865 in words is "one million, eight hundred sixty thousand, eight hundred sixty-five".