1871871858 has 12 divisors (see below), whose sum is σ = 4055722398. Its totient is φ = 623957280.

The previous prime is 1871871857. The next prime is 1871871871. The reversal of 1871871858 is 8581781781.

It can be written as a sum of positive squares in only one way, i.e., 1716196329 + 155675529 = 41427^2 + 12477^2 .

It is not an unprimeable number, because it can be changed into a prime (1871871857) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 51996423 + ... + 51996458.

Almost surely, 2^1871871858 is an apocalyptic number.

1871871858 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1871871858 is an abundant number, since it is smaller than the sum of its proper divisors (2183850540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1871871858 is a wasteful number, since it uses less digits than its factorization.

1871871858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103992889 (or 103992886 counting only the distinct ones).

The product of its digits is 1003520, while the sum is 54.

The square root of 1871871858 is about 43265.1344387140. The cubic root of 1871871858 is about 1232.4199077622.

The spelling of 1871871858 in words is "one billion, eight hundred seventy-one million, eight hundred seventy-one thousand, eight hundred fifty-eight".