138898028 has 24 divisors (see below), whose sum is σ = 248300640. Its totient is φ = 67971200.

The previous prime is 138898027. The next prime is 138898031. The reversal of 138898028 is 820898831.

It is not an unprimeable number, because it can be changed into a prime (138898027) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 34025 + ... + 37887.

It is an arithmetic number, because the mean of its divisors is an integer number (10345860).

Almost surely, 2^138898028 is an apocalyptic number.

It is an amenable number.

138898028 is a deficient number, since it is larger than the sum of its proper divisors (109402612).

138898028 is a wasteful number, since it uses less digits than its factorization.

138898028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4057 (or 4055 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 47.

The square root of 138898028 is about 11785.5007530440. The cubic root of 138898028 is about 517.8834430138.

The spelling of 138898028 in words is "one hundred thirty-eight million, eight hundred ninety-eight thousand, twenty-eight".