1861726 has 4 divisors (see below), whose sum is σ = 2792592. Its totient is φ = 930862.

The previous prime is 1861711. The next prime is 1861747. The reversal of 1861726 is 6271681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6271681 = 13 ⋅482437.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 as a sum of consecutive naturals, namely, 465430 + ... + 465433.

It is an arithmetic number, because the mean of its divisors is an integer number (698148).

2^1861726 is an apocalyptic number.

1861726 is a deficient number, since it is larger than the sum of its proper divisors (930866).

1861726 is an equidigital number, since it uses as much as digits as its factorization.

1861726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930865.

The product of its digits is 4032, while the sum is 31.

The square root of 1861726 is about 1364.4508052693. The cubic root of 1861726 is about 123.0189232128.

The spelling of 1861726 in words is "one million, eight hundred sixty-one thousand, seven hundred twenty-six".