138743628 has 24 divisors (see below), whose sum is σ = 331265088. Its totient is φ = 45172176.

The previous prime is 138743623. The next prime is 138743639. The reversal of 138743628 is 826347831.

It is a self number, because there is not a number n which added to its sum of digits gives 138743628.

It is not an unprimeable number, because it can be changed into a prime (138743621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133926 + ... + 134957.

It is an arithmetic number, because the mean of its divisors is an integer number (13802712).

Almost surely, 2^138743628 is an apocalyptic number.

It is an amenable number.

138743628 is an abundant number, since it is smaller than the sum of its proper divisors (192521460).

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

138743628 is a wasteful number, since it uses less digits than its factorization.

138743628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268933 (or 268931 counting only the distinct ones).

The product of its digits is 193536, while the sum is 42.

The square root of 138743628 is about 11778.9485099477. The cubic root of 138743628 is about 517.6914776045.

The spelling of 138743628 in words is "one hundred thirty-eight million, seven hundred forty-three thousand, six hundred twenty-eight".