1868871642 has 64 divisors (see below), whose sum is σ = 4456747008. Its totient is φ = 515808000.

The previous prime is 1868871629. The next prime is 1868871643. The reversal of 1868871642 is 2461788681.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (1868871643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7917 + ... + 61647.

It is an arithmetic number, because the mean of its divisors is an integer number (69636672).

Almost surely, 2^1868871642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1868871642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2228373504).

1868871642 is an abundant number, since it is smaller than the sum of its proper divisors (2587875366).

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

1868871642 is a wasteful number, since it uses less digits than its factorization.

1868871642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53795.

The product of its digits is 1032192, while the sum is 51.

The square root of 1868871642 is about 43230.4480892808. The cubic root of 1868871642 is about 1231.7611192306.

The spelling of 1868871642 in words is "one billion, eight hundred sixty-eight million, eight hundred seventy-one thousand, six hundred forty-two".