1868139171390 has 16 divisors (see below), whose sum is σ = 4483534011408. Its totient is φ = 498170445696.

The previous prime is 1868139171383. The next prime is 1868139171391. The reversal of 1868139171390 is 931719318681.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1868139171390.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1868139171391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31135652827 + ... + 31135652886.

It is an arithmetic number, because the mean of its divisors is an integer number (280220875713).

Almost surely, 2^{1868139171390} is an apocalyptic number.

1868139171390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1868139171390 is an abundant number, since it is smaller than the sum of its proper divisors (2615394840018).

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

1868139171390 is a wasteful number, since it uses less digits than its factorization.

1868139171390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62271305723.

The product of its (nonzero) digits is 1959552, while the sum is 57.

The spelling of 1868139171390 in words is "one trillion, eight hundred sixty-eight billion, one hundred thirty-nine million, one hundred seventy-one thousand, three hundred ninety".