1872861 has 8 divisors (see below), whose sum is σ = 2544480. Its totient is φ = 1224912.

The previous prime is 1872859. The next prime is 1872889. The reversal of 1872861 is 1682781.

It is a happy number.

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

It is not a de Polignac number, because 1872861 - 2¹ = 1872859 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1872841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5731 + ... + 6048.

It is an arithmetic number, because the mean of its divisors is an integer number (318060).

2^1872861 is an apocalyptic number.

It is an amenable number.

1872861 is a deficient number, since it is larger than the sum of its proper divisors (671619).

1872861 is a wasteful number, since it uses less digits than its factorization.

1872861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11835.

The product of its digits is 5376, while the sum is 33.

The square root of 1872861 is about 1368.5251185126. The cubic root of 1872861 is about 123.2636949619.

The spelling of 1872861 in words is "one million, eight hundred seventy-two thousand, eight hundred sixty-one".