138491528 has 16 divisors (see below), whose sum is σ = 296767680. Its totient is φ = 59353488.

The previous prime is 138491489. The next prime is 138491531. The reversal of 138491528 is 825194831.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1236476 + ... + 1236587.

It is an arithmetic number, because the mean of its divisors is an integer number (18547980).

Almost surely, 2^138491528 is an apocalyptic number.

It is an amenable number.

138491528 is an abundant number, since it is smaller than the sum of its proper divisors (158276152).

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

138491528 is a wasteful number, since it uses less digits than its factorization.

138491528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2473076 (or 2473072 counting only the distinct ones).

The product of its digits is 69120, while the sum is 41.

The square root of 138491528 is about 11768.2423496459. The cubic root of 138491528 is about 517.3777355135.

The spelling of 138491528 in words is "one hundred thirty-eight million, four hundred ninety-one thousand, five hundred twenty-eight".