1667706138 has 64 divisors (see below), whose sum is σ = 4261585920. Its totient is φ = 473546736.

The previous prime is 1667706127. The next prime is 1667706193. The reversal of 1667706138 is 8316077661.

It is a junction number, because it is equal to n+sod(n) for n = 1667706093 and 1667706102.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48081 + ... + 75147.

It is an arithmetic number, because the mean of its divisors is an integer number (66587280).

Almost surely, 2^1667706138 is an apocalyptic number.

1667706138 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 1667706138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2130792960).

1667706138 is an abundant number, since it is smaller than the sum of its proper divisors (2593879782).

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

1667706138 is a wasteful number, since it uses less digits than its factorization.

1667706138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27248 (or 27242 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The square root of 1667706138 is about 40837.5579338432. The cubic root of 1667706138 is about 1185.8775361798.

The spelling of 1667706138 in words is "one billion, six hundred sixty-seven million, seven hundred six thousand, one hundred thirty-eight".