1897852861 has 4 divisors (see below), whose sum is σ = 1900265152. Its totient is φ = 1895440572.

The previous prime is 1897852807. The next prime is 1897852871. The reversal of 1897852861 is 1682587981.

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 a cyclic number.

It is not a de Polignac number, because 1897852861 - 2²¹ = 1895755709 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 (1897852871) 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, 1204965 + ... + 1206538.

It is an arithmetic number, because the mean of its divisors is an integer number (475066288).

Almost surely, 2^1897852861 is an apocalyptic number.

It is an amenable number.

1897852861 is a deficient number, since it is larger than the sum of its proper divisors (2412291).

1897852861 is an equidigital number, since it uses as much as digits as its factorization.

1897852861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2412290.

The product of its digits is 1935360, while the sum is 55.

The square root of 1897852861 is about 43564.3530997535. The cubic root of 1897852861 is about 1238.0955984248.

The spelling of 1897852861 in words is "one billion, eight hundred ninety-seven million, eight hundred fifty-two thousand, eight hundred sixty-one".