1854081849 has 4 divisors (see below), whose sum is σ = 2472109136. Its totient is φ = 1236054564.

The previous prime is 1854081839. The next prime is 1854081919. The reversal of 1854081849 is 9481804581.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1854081849 - 2⁴ = 1854081833 is a prime.

It is a super-3 number, since 3×1854081849³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1854081798 and 1854081807.

It is not an unprimeable number, because it can be changed into a prime (1854081839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 309013639 + ... + 309013644.

It is an arithmetic number, because the mean of its divisors is an integer number (618027284).

Almost surely, 2^1854081849 is an apocalyptic number.

It is an amenable number.

1854081849 is a deficient number, since it is larger than the sum of its proper divisors (618027287).

1854081849 is an equidigital number, since it uses as much as digits as its factorization.

1854081849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618027286.

The product of its (nonzero) digits is 368640, while the sum is 48.

The square root of 1854081849 is about 43059.0507210737. The cubic root of 1854081849 is about 1228.5032246042.

The spelling of 1854081849 in words is "one billion, eight hundred fifty-four million, eighty-one thousand, eight hundred forty-nine".