1861165 has 8 divisors (see below), whose sum is σ = 2243808. Its totient is φ = 1482000.

The previous prime is 1861157. The next prime is 1861187. The reversal of 1861165 is 5611681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1861165 - 2³ = 1861157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 514 + ... + 1996.

It is an arithmetic number, because the mean of its divisors is an integer number (280476).

2^1861165 is an apocalyptic number.

It is an amenable number.

1861165 is a deficient number, since it is larger than the sum of its proper divisors (382643).

1861165 is a wasteful number, since it uses less digits than its factorization.

1861165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1739.

The product of its digits is 1440, while the sum is 28.

The square root of 1861165 is about 1364.2452125626. The cubic root of 1861165 is about 123.0065654063.

The spelling of 1861165 in words is "one million, eight hundred sixty-one thousand, one hundred sixty-five".