1870188138 has 144 divisors (see below), whose sum is σ = 5089309056. Its totient is φ = 485896320.

The previous prime is 1870188113. The next prime is 1870188169. The reversal of 1870188138 is 8318810781.

It is a junction number, because it is equal to n+sod(n) for n = 1870188093 and 1870188102.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1511256 + ... + 1512492.

It is an arithmetic number, because the mean of its divisors is an integer number (35342424).

Almost surely, 2^1870188138 is an apocalyptic number.

1870188138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1870188138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2544654528).

1870188138 is an abundant number, since it is smaller than the sum of its proper divisors (3219120918).

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

1870188138 is a wasteful number, since it uses less digits than its factorization.

1870188138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1349 (or 1333 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 45.

The square root of 1870188138 is about 43245.6718990467. The cubic root of 1870188138 is about 1232.0502826536.

The spelling of 1870188138 in words is "one billion, eight hundred seventy million, one hundred eighty-eight thousand, one hundred thirty-eight".