1860561 has 12 divisors (see below), whose sum is σ = 2732340. Its totient is φ = 1219680.

The previous prime is 1860559. The next prime is 1860569. The reversal of 1860561 is 1650681.

It can be written as a sum of positive squares in 2 ways, for example, as 938961 + 921600 = 969^2 + 960^2 .

It is not a de Polignac number, because 1860561 - 2¹ = 1860559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1860569) 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 11 ways as a sum of consecutive naturals, for example, 1146 + ... + 2243.

It is an arithmetic number, because the mean of its divisors is an integer number (227695).

2^1860561 is an apocalyptic number.

It is an amenable number.

1860561 is a deficient number, since it is larger than the sum of its proper divisors (871779).

1860561 is a wasteful number, since it uses less digits than its factorization.

1860561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3456 (or 3453 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1860561 is about 1364.0238267714. The cubic root of 1860561 is about 122.9932576118.

The spelling of 1860561 in words is "one million, eight hundred sixty thousand, five hundred sixty-one".