1861886 has 16 divisors (see below), whose sum is σ = 3166800. Its totient is φ = 813888.

The previous prime is 1861879. The next prime is 1861889. The reversal of 1861886 is 6881681.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861889) 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, 1391 + ... + 2378.

It is an arithmetic number, because the mean of its divisors is an integer number (197925).

2^1861886 is an apocalyptic number.

1861886 is a deficient number, since it is larger than the sum of its proper divisors (1304914).

1861886 is a wasteful number, since it uses less digits than its factorization.

1861886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3803.

The product of its digits is 18432, while the sum is 38.

The square root of 1861886 is about 1364.5094356581. The cubic root of 1861886 is about 123.0224472659.

The spelling of 1861886 in words is "one million, eight hundred sixty-one thousand, eight hundred eighty-six".