1861206 has 16 divisors (see below), whose sum is σ = 3884544. Its totient is φ = 593384.

The previous prime is 1861187. The next prime is 1861219. The reversal of 1861206 is 6021681.

It is a Curzon 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 in 7 ways as a sum of consecutive naturals, for example, 6606 + ... + 6881.

It is an arithmetic number, because the mean of its divisors is an integer number (242784).

2^1861206 is an apocalyptic number.

1861206 is an abundant number, since it is smaller than the sum of its proper divisors (2023338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1861206 is a wasteful number, since it uses less digits than its factorization.

1861206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13515.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 1861206 is about 1364.2602391040. The cubic root of 1861206 is about 123.0074686456.

Adding to 1861206 its reverse (6021681), we get a palindrome (7882887).

The spelling of 1861206 in words is "one million, eight hundred sixty-one thousand, two hundred six".