1871742889 has 4 divisors (see below), whose sum is σ = 1874524756. Its totient is φ = 1868961024.

The previous prime is 1871742881. The next prime is 1871742907. The reversal of 1871742889 is 9882471781.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1426195225 + 445547664 = 37765^2 + 21108^2 .

It is a cyclic number.

It is not a de Polignac number, because 1871742889 - 2³ = 1871742881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1871742881) 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, 1389924 + ... + 1391269.

It is an arithmetic number, because the mean of its divisors is an integer number (468631189).

Almost surely, 2^1871742889 is an apocalyptic number.

It is an amenable number.

1871742889 is a deficient number, since it is larger than the sum of its proper divisors (2781867).

1871742889 is an equidigital number, since it uses as much as digits as its factorization.

1871742889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2781866.

The product of its digits is 1806336, while the sum is 55.

The square root of 1871742889 is about 43263.6439634943. The cubic root of 1871742889 is about 1232.3916031870.

The spelling of 1871742889 in words is "one billion, eight hundred seventy-one million, seven hundred forty-two thousand, eight hundred eighty-nine".