138593780 has 24 divisors (see below), whose sum is σ = 313435752. Its totient is φ = 51172992.

The previous prime is 138593779. The next prime is 138593789. The reversal of 138593780 is 87395831.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3429904 + 135163876 = 1852^2 + 11626^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138593789) 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, 266267 + ... + 266786.

It is an arithmetic number, because the mean of its divisors is an integer number (13059823).

Almost surely, 2^138593780 is an apocalyptic number.

138593780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138593780 is an abundant number, since it is smaller than the sum of its proper divisors (174841972).

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

138593780 is a wasteful number, since it uses less digits than its factorization.

138593780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533075 (or 533073 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 138593780 is about 11772.5859521177. The cubic root of 138593780 is about 517.5050354633.

The spelling of 138593780 in words is "one hundred thirty-eight million, five hundred ninety-three thousand, seven hundred eighty".