1851606 has 32 divisors (see below), whose sum is σ = 4358880. Its totient is φ = 580608.

The previous prime is 1851587. The next prime is 1851611. The reversal of 1851606 is 6061581.

1851606 is a `hidden beast` number, since 1 + 8 + 51 + 606 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 1851606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91 + ... + 1926.

It is an arithmetic number, because the mean of its divisors is an integer number (136215).

2^1851606 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1851606, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2179440).

1851606 is an abundant number, since it is smaller than the sum of its proper divisors (2507274).

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

1851606 is a wasteful number, since it uses less digits than its factorization.

1851606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2045 (or 2039 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1851606 is about 1360.7373001428. The cubic root of 1851606 is about 122.7956153584.

The spelling of 1851606 in words is "one million, eight hundred fifty-one thousand, six hundred six".