1851156 has 18 divisors (see below), whose sum is σ = 4679402. Its totient is φ = 617040.

The previous prime is 1851139. The next prime is 1851163. The reversal of 1851156 is 6511581.

It can be written as a sum of positive squares in only one way, i.e., 1648656 + 202500 = 1284^2 + 450^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a nialpdrome in base 12.

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 5 ways as a sum of consecutive naturals, for example, 25675 + ... + 25746.

2^1851156 is an apocalyptic number.

It is an amenable number.

1851156 is an abundant number, since it is smaller than the sum of its proper divisors (2828246).

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

1851156 is a wasteful number, since it uses less digits than its factorization.

1851156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51431 (or 51426 counting only the distinct ones).

The product of its digits is 1200, while the sum is 27.

The square root of 1851156 is about 1360.5719385611. The cubic root of 1851156 is about 122.7856667869.

The spelling of 1851156 in words is "one million, eight hundred fifty-one thousand, one hundred fifty-six".