1865945 has 8 divisors (see below), whose sum is σ = 2254344. Its totient is φ = 1482624.

The previous prime is 1865939. The next prime is 1865957. The reversal of 1865945 is 5495681.

It can be written as a sum of positive squares in 4 ways, for example, as 48841 + 1817104 = 221^2 + 1348^2 .

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 1865945 - 2⁶ = 1865881 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1865899 and 1865908.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 404 + ... + 1973.

It is an arithmetic number, because the mean of its divisors is an integer number (281793).

2^1865945 is an apocalyptic number.

It is an amenable number.

1865945 is a deficient number, since it is larger than the sum of its proper divisors (388399).

1865945 is a wasteful number, since it uses less digits than its factorization.

1865945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2539.

The product of its digits is 43200, while the sum is 38.

The square root of 1865945 is about 1365.9959736397. The cubic root of 1865945 is about 123.1117806416. Note that the first 3 decimals are identical.

The spelling of 1865945 in words is "one million, eight hundred sixty-five thousand, nine hundred forty-five".