138530772 has 36 divisors (see below), whose sum is σ = 352025856. Its totient is φ = 45932880.

The previous prime is 138530753. The next prime is 138530783. The reversal of 138530772 is 277035831.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3198 + ... + 16949.

It is an arithmetic number, because the mean of its divisors is an integer number (9778496).

Almost surely, 2^138530772 is an apocalyptic number.

138530772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138530772 is an abundant number, since it is smaller than the sum of its proper divisors (213495084).

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

138530772 is a wasteful number, since it uses less digits than its factorization.

138530772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20348 (or 20343 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 138530772 is about 11769.9096003325. The cubic root of 138530772 is about 517.4266002458.

The spelling of 138530772 in words is "one hundred thirty-eight million, five hundred thirty thousand, seven hundred seventy-two".