138571788 has 48 divisors (see below), whose sum is σ = 342720000. Its totient is φ = 43455168.

The previous prime is 138571781. The next prime is 138571813. The reversal of 138571788 is 887175831.

It is a happy number.

138571788 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (138571781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31933 + ... + 36011.

It is an arithmetic number, because the mean of its divisors is an integer number (7140000).

Almost surely, 2^138571788 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138571788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (171360000).

138571788 is an abundant number, since it is smaller than the sum of its proper divisors (204148212).

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

138571788 is a wasteful number, since it uses less digits than its factorization.

138571788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4254 (or 4252 counting only the distinct ones).

The product of its digits is 376320, while the sum is 48.

The square root of 138571788 is about 11771.6518806835. The cubic root of 138571788 is about 517.4776615250.

The spelling of 138571788 in words is "one hundred thirty-eight million, five hundred seventy-one thousand, seven hundred eighty-eight".