1861065 has 12 divisors (see below), whose sum is σ = 3225924. Its totient is φ = 992544.

The previous prime is 1861061. The next prime is 1861081. The reversal of 1861065 is 5601681.

It can be written as a sum of positive squares in 2 ways, for example, as 962361 + 898704 = 981^2 + 948^2 .

It is not a de Polignac number, because 1861065 - 2² = 1861061 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1861061) 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, 20634 + ... + 20723.

It is an arithmetic number, because the mean of its divisors is an integer number (268827).

2^1861065 is an apocalyptic number.

1861065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1861065 is a deficient number, since it is larger than the sum of its proper divisors (1364859).

1861065 is a wasteful number, since it uses less digits than its factorization.

1861065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41368 (or 41365 counting only the distinct ones).

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

The square root of 1861065 is about 1364.2085617676. The cubic root of 1861065 is about 123.0043623279.

The spelling of 1861065 in words is "one million, eight hundred sixty-one thousand, sixty-five".