1861273 has 4 divisors (see below), whose sum is σ = 1892880. Its totient is φ = 1829668.

The previous prime is 1861267. The next prime is 1861303. The reversal of 1861273 is 3721681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3721681 = 401 ⋅9281.

It is a cyclic number.

It is not a de Polignac number, because 1861273 - 2¹³ = 1853081 is a prime.

It is a Duffinian number.

1861273 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1861253) 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 3 ways as a sum of consecutive naturals, for example, 15715 + ... + 15832.

It is an arithmetic number, because the mean of its divisors is an integer number (473220).

2^1861273 is an apocalyptic number.

It is an amenable number.

1861273 is a deficient number, since it is larger than the sum of its proper divisors (31607).

1861273 is an equidigital number, since it uses as much as digits as its factorization.

1861273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31606.

The product of its digits is 2016, while the sum is 28.

The square root of 1861273 is about 1364.2847943153. The cubic root of 1861273 is about 123.0089446422.

The spelling of 1861273 in words is "one million, eight hundred sixty-one thousand, two hundred seventy-three".