138873528 has 48 divisors (see below), whose sum is σ = 390051480. Its totient is φ = 46290528.

The previous prime is 138873499. The next prime is 138873529. The reversal of 138873528 is 825378831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138873529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33775 + ... + 37662.

Almost surely, 2^138873528 is an apocalyptic number.

138873528 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

138873528 is an abundant number, since it is smaller than the sum of its proper divisors (251177952).

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

138873528 is an equidigital number, since it uses as much as digits as its factorization.

138873528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71458 (or 71442 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 138873528 is about 11784.4612944334. The cubic root of 138873528 is about 517.8529916804.

The spelling of 138873528 in words is "one hundred thirty-eight million, eight hundred seventy-three thousand, five hundred twenty-eight".