138779120 has 20 divisors (see below), whose sum is σ = 322661640. Its totient is φ = 55511616.

The previous prime is 138779101. The next prime is 138779141. The reversal of 138779120 is 21977831.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 867290 + ... + 867449.

It is an arithmetic number, because the mean of its divisors is an integer number (16133082).

Almost surely, 2^138779120 is an apocalyptic number.

138779120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138779120 is an abundant number, since it is smaller than the sum of its proper divisors (183882520).

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

138779120 is a wasteful number, since it uses less digits than its factorization.

138779120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1734752 (or 1734746 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 38.

The square root of 138779120 is about 11780.4549997018. The cubic root of 138779120 is about 517.7356173839.

The spelling of 138779120 in words is "one hundred thirty-eight million, seven hundred seventy-nine thousand, one hundred twenty".