1854856897 has 4 divisors (see below), whose sum is σ = 1855445380. Its totient is φ = 1854268416.

The previous prime is 1854856831. The next prime is 1854856909. The reversal of 1854856897 is 7986584581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7986584581 = 17 ⋅469799093.

It can be written as a sum of positive squares in 2 ways, for example, as 987907761 + 866949136 = 31431^2 + 29444^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1854856897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1854851897) 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, 289488 + ... + 295825.

It is an arithmetic number, because the mean of its divisors is an integer number (463861345).

Almost surely, 2^1854856897 is an apocalyptic number.

It is an amenable number.

1854856897 is a deficient number, since it is larger than the sum of its proper divisors (588483).

1854856897 is an equidigital number, since it uses as much as digits as its factorization.

1854856897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588482.

The product of its digits is 19353600, while the sum is 61.

The square root of 1854856897 is about 43068.0496075687. The cubic root of 1854856897 is about 1228.6743814359.

The spelling of 1854856897 in words is "one billion, eight hundred fifty-four million, eight hundred fifty-six thousand, eight hundred ninety-seven".