138820132 has 12 divisors (see below), whose sum is σ = 265020336. Its totient is φ = 63100040.

The previous prime is 138820127. The next prime is 138820133. The reversal of 138820132 is 231028831.

It is a self number, because there is not a number n which added to its sum of digits gives 138820132.

It is not an unprimeable number, because it can be changed into a prime (138820133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1577458 + ... + 1577545.

It is an arithmetic number, because the mean of its divisors is an integer number (22085028).

Almost surely, 2^138820132 is an apocalyptic number.

It is an amenable number.

138820132 is a deficient number, since it is larger than the sum of its proper divisors (126200204).

138820132 is a wasteful number, since it uses less digits than its factorization.

138820132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3155018 (or 3155016 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 138820132 is about 11782.1955509149. The cubic root of 138820132 is about 517.7866127638.

Adding to 138820132 its reverse (231028831), we get a palindrome (369848963).

The spelling of 138820132 in words is "one hundred thirty-eight million, eight hundred twenty thousand, one hundred thirty-two".