138561384 has 64 divisors (see below), whose sum is σ = 389289600. Its totient is φ = 40778496.

The previous prime is 138561383. The next prime is 138561419. The reversal of 138561384 is 483165831.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (138561383) 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, 2479 + ... + 16830.

It is an arithmetic number, because the mean of its divisors is an integer number (6082650).

Almost surely, 2^138561384 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 138561384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194644800).

138561384 is an abundant number, since it is smaller than the sum of its proper divisors (250728216).

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

138561384 is a wasteful number, since it uses less digits than its factorization.

138561384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19354 (or 19350 counting only the distinct ones).

The product of its digits is 69120, while the sum is 39.

The square root of 138561384 is about 11771.2099632960. The cubic root of 138561384 is about 517.4647104223.

The spelling of 138561384 in words is "one hundred thirty-eight million, five hundred sixty-one thousand, three hundred eighty-four".