138924805 has 8 divisors (see below), whose sum is σ = 167583744. Its totient is φ = 110557200.

The previous prime is 138924791. The next prime is 138924811. The reversal of 138924805 is 508429831.

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

It is not a de Polignac number, because 138924805 - 2⁹ = 138924293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71781 + ... + 73690.

It is an arithmetic number, because the mean of its divisors is an integer number (20947968).

Almost surely, 2^138924805 is an apocalyptic number.

It is an amenable number.

138924805 is a deficient number, since it is larger than the sum of its proper divisors (28658939).

138924805 is a wasteful number, since it uses less digits than its factorization.

138924805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145667.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 138924805 is about 11786.6367128202. The cubic root of 138924805 is about 517.9167203615.

The spelling of 138924805 in words is "one hundred thirty-eight million, nine hundred twenty-four thousand, eight hundred five".