1861255 has 16 divisors (see below), whose sum is σ = 2496384. Its totient is φ = 1320480.

The previous prime is 1861253. The next prime is 1861261. The reversal of 1861255 is 5521681.

It is not a de Polignac number, because 1861255 - 2¹ = 1861253 is a prime.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 1972 + ... + 2758.

It is an arithmetic number, because the mean of its divisors is an integer number (156024).

2^1861255 is an apocalyptic number.

1861255 is a deficient number, since it is larger than the sum of its proper divisors (635129).

1861255 is a wasteful number, since it uses less digits than its factorization.

1861255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846.

The product of its digits is 2400, while the sum is 28.

The square root of 1861255 is about 1364.2781974363. The cubic root of 1861255 is about 123.0085481093.

It can be divided in two parts, 1861 and 255, that added together give a square (2116 = 46²).

The spelling of 1861255 in words is "one million, eight hundred sixty-one thousand, two hundred fifty-five".