138633509 has 8 divisors (see below), whose sum is σ = 160007808. Its totient is φ = 117651600.

The previous prime is 138633491. The next prime is 138633533. The reversal of 138633509 is 905336831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138633509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138633559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97337 + ... + 98750.

It is an arithmetic number, because the mean of its divisors is an integer number (20000976).

Almost surely, 2^138633509 is an apocalyptic number.

It is an amenable number.

138633509 is a deficient number, since it is larger than the sum of its proper divisors (21374299).

138633509 is a wasteful number, since it uses less digits than its factorization.

138633509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196195.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 138633509 is about 11774.2731835133. The cubic root of 138633509 is about 517.5544797056.

The spelling of 138633509 in words is "one hundred thirty-eight million, six hundred thirty-three thousand, five hundred nine".