1861606 has 8 divisors (see below), whose sum is σ = 2811600. Its totient is φ = 924408.

The previous prime is 1861591. The next prime is 1861621. The reversal of 1861606 is 6061681.

It is an interprime number because it is at equal distance from previous prime (1861591) and next prime (1861621).

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

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2826 + ... + 3421.

It is an arithmetic number, because the mean of its divisors is an integer number (351450).

2^1861606 is an apocalyptic number.

1861606 is a deficient number, since it is larger than the sum of its proper divisors (949994).

1861606 is a wasteful number, since it uses less digits than its factorization.

1861606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6398.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 1861606 is about 1364.4068308243. The cubic root of 1861606 is about 123.0162800405.

The spelling of 1861606 in words is "one million, eight hundred sixty-one thousand, six hundred six".