138534788 has 24 divisors (see below), whose sum is σ = 277544064. Its totient is φ = 59270400.

The previous prime is 138534787. The next prime is 138534797. The reversal of 138534788 is 887435831.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (138534787) 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, 13748 + ... + 21588.

It is an arithmetic number, because the mean of its divisors is an integer number (11564336).

Almost surely, 2^138534788 is an apocalyptic number.

It is an amenable number.

138534788 is an abundant number, since it is smaller than the sum of its proper divisors (139009276).

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

138534788 is a wasteful number, since it uses less digits than its factorization.

138534788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8483 (or 8481 counting only the distinct ones).

The product of its digits is 645120, while the sum is 47.

The square root of 138534788 is about 11770.0802036350. The cubic root of 138534788 is about 517.4316002544.

The spelling of 138534788 in words is "one hundred thirty-eight million, five hundred thirty-four thousand, seven hundred eighty-eight".