138866328 has 48 divisors (see below), whose sum is σ = 386268480. Its totient is φ = 45036864.

The previous prime is 138866311. The next prime is 138866333. The reversal of 138866328 is 823668831.

138866328 is a `hidden beast` number, since 1 + 3 + 8 + 8 + 6 + 632 + 8 = 666.

It is a nude number because it is divisible by every one of its digits.

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, 23400 + ... + 28727.

It is an arithmetic number, because the mean of its divisors is an integer number (8047260).

Almost surely, 2^138866328 is an apocalyptic number.

138866328 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

138866328 is an abundant number, since it is smaller than the sum of its proper divisors (247402152).

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

138866328 is a wasteful number, since it uses less digits than its factorization.

138866328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52176 (or 52169 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 138866328 is about 11784.1558034507. The cubic root of 138866328 is about 517.8440420363.

The spelling of 138866328 in words is "one hundred thirty-eight million, eight hundred sixty-six thousand, three hundred twenty-eight".