1856649085 has 8 divisors (see below), whose sum is σ = 2288194776. Its totient is φ = 1445175360.

The previous prime is 1856649061. The next prime is 1856649089. The reversal of 1856649085 is 5809466581.

It can be written as a sum of positive squares in 4 ways, for example, as 415915236 + 1440733849 = 20394^2 + 37957^2 .

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

It is not a de Polignac number, because 1856649085 - 2¹⁵ = 1856616317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1856649089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5017786 + ... + 5018155.

It is an arithmetic number, because the mean of its divisors is an integer number (286024347).

Almost surely, 2^1856649085 is an apocalyptic number.

It is an amenable number.

1856649085 is a deficient number, since it is larger than the sum of its proper divisors (431545691).

1856649085 is a wasteful number, since it uses less digits than its factorization.

1856649085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10035983.

The product of its (nonzero) digits is 2073600, while the sum is 52.

The square root of 1856649085 is about 43088.8510522154. The cubic root of 1856649085 is about 1229.0699746953.

The spelling of 1856649085 in words is "one billion, eight hundred fifty-six million, six hundred forty-nine thousand, eighty-five".