138891030 has 32 divisors (see below), whose sum is σ = 333656064. Its totient is φ = 37002336.

The previous prime is 138891017. The next prime is 138891079. The reversal of 138891030 is 30198831.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 138890982 and 138891000.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50347 + ... + 53033.

It is an arithmetic number, because the mean of its divisors is an integer number (10426752).

Almost surely, 2^138891030 is an apocalyptic number.

138891030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138891030 is an abundant number, since it is smaller than the sum of its proper divisors (194765034).

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

138891030 is a wasteful number, since it uses less digits than its factorization.

138891030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4420.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 138891030 is about 11785.2038590769. The cubic root of 138891030 is about 517.8747454840.

The spelling of 138891030 in words is "one hundred thirty-eight million, eight hundred ninety-one thousand, thirty".