138355436 has 12 divisors (see below), whose sum is σ = 243065928. Its totient is φ = 68908032.

The previous prime is 138355423. The next prime is 138355447. The reversal of 138355436 is 634553831.

138355436 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 138355436.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66266 + ... + 68321.

It is an arithmetic number, because the mean of its divisors is an integer number (20255494).

Almost surely, 2^138355436 is an apocalyptic number.

It is an amenable number.

138355436 is a deficient number, since it is larger than the sum of its proper divisors (104710492).

138355436 is a wasteful number, since it uses less digits than its factorization.

138355436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134848 (or 134846 counting only the distinct ones).

The product of its digits is 129600, while the sum is 38.

The square root of 138355436 is about 11762.4587565696. The cubic root of 138355436 is about 517.2082087849.

The spelling of 138355436 in words is "one hundred thirty-eight million, three hundred fifty-five thousand, four hundred thirty-six".