138387732 has 24 divisors (see below), whose sum is σ = 369034176. Its totient is φ = 39539328.

The previous prime is 138387719. The next prime is 138387737. The reversal of 138387732 is 237783831.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138387737) 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, 823653 + ... + 823820.

It is an arithmetic number, because the mean of its divisors is an integer number (15376424).

Almost surely, 2^138387732 is an apocalyptic number.

138387732 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138387732 is an abundant number, since it is smaller than the sum of its proper divisors (230646444).

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

138387732 is a wasteful number, since it uses less digits than its factorization.

138387732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1647487 (or 1647485 counting only the distinct ones).

The product of its digits is 169344, while the sum is 42.

The square root of 138387732 is about 11763.8315186847. The cubic root of 138387732 is about 517.2484492391.

The spelling of 138387732 in words is "one hundred thirty-eight million, three hundred eighty-seven thousand, seven hundred thirty-two".