138890428 has 6 divisors (see below), whose sum is σ = 243058256. Its totient is φ = 69445212.

The previous prime is 138890417. The next prime is 138890429. The reversal of 138890428 is 824098831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138890429) 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 as a sum of consecutive naturals, namely, 17361300 + ... + 17361307.

Almost surely, 2^138890428 is an apocalyptic number.

It is an amenable number.

138890428 is a deficient number, since it is larger than the sum of its proper divisors (104167828).

138890428 is a wasteful number, since it uses less digits than its factorization.

138890428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34722611 (or 34722609 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 43.

The square root of 138890428 is about 11785.1783185491. The cubic root of 138890428 is about 517.8739972690.

The spelling of 138890428 in words is "one hundred thirty-eight million, eight hundred ninety thousand, four hundred twenty-eight".