138737828 has 12 divisors (see below), whose sum is σ = 245519820. Its totient is φ = 68589312.

The previous prime is 138737821. The next prime is 138737873. The reversal of 138737828 is 828737831.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 31449664 + 107288164 = 5608^2 + 10358^2 .

It is not an unprimeable number, because it can be changed into a prime (138737821) 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 3 ways as a sum of consecutive naturals, for example, 194501 + ... + 195212.

It is an arithmetic number, because the mean of its divisors is an integer number (20459985).

Almost surely, 2^138737828 is an apocalyptic number.

It is an amenable number.

138737828 is a deficient number, since it is larger than the sum of its proper divisors (106781992).

138737828 is a wasteful number, since it uses less digits than its factorization.

138737828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389806 (or 389804 counting only the distinct ones).

The product of its digits is 451584, while the sum is 47.

The square root of 138737828 is about 11778.7023054325. The cubic root of 138737828 is about 517.6842636938.

The spelling of 138737828 in words is "one hundred thirty-eight million, seven hundred thirty-seven thousand, eight hundred twenty-eight".