138235904 has 26 divisors (see below), whose sum is σ = 276446250. Its totient is φ = 69115904.

The previous prime is 138235897. The next prime is 138235949. The reversal of 138235904 is 409532831.

It can be written as a sum of positive squares in only one way, i.e., 135675904 + 2560000 = 11648^2 + 1600^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12779 + ... + 20970.

Almost surely, 2^138235904 is an apocalyptic number.

It is an amenable number.

138235904 is a deficient number, since it is larger than the sum of its proper divisors (138210346).

138235904 is an frugal number, since it uses more digits than its factorization.

138235904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33773 (or 33751 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 138235904 is about 11757.3765781317. The cubic root of 138235904 is about 517.0592187491.

The spelling of 138235904 in words is "one hundred thirty-eight million, two hundred thirty-five thousand, nine hundred four".