138250428 has 12 divisors (see below), whose sum is σ = 322584360. Its totient is φ = 46083472.

The previous prime is 138250367. The next prime is 138250433. The reversal of 138250428 is 824052831.

138250428 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×138250428² = 38226361684366368, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 5760423 + ... + 5760446.

It is an arithmetic number, because the mean of its divisors is an integer number (26882030).

Almost surely, 2^138250428 is an apocalyptic number.

It is an amenable number.

138250428 is an abundant number, since it is smaller than the sum of its proper divisors (184333932).

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

138250428 is a wasteful number, since it uses less digits than its factorization.

138250428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11520876 (or 11520874 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 138250428 is about 11757.9942167021. The cubic root of 138250428 is about 517.0773266956.

The spelling of 138250428 in words is "one hundred thirty-eight million, two hundred fifty thousand, four hundred twenty-eight".