138824669 has 8 divisors (see below), whose sum is σ = 147339648. Its totient is φ = 130348480.

The previous prime is 138824657. The next prime is 138824671. The reversal of 138824669 is 966428831.

138824669 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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-138824669 is a prime.

It is a super-2 number, since 2×138824669² = 38544577445919122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138824269) 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, 2147 + ... + 16800.

It is an arithmetic number, because the mean of its divisors is an integer number (18417456).

Almost surely, 2^138824669 is an apocalyptic number.

It is an amenable number.

138824669 is a deficient number, since it is larger than the sum of its proper divisors (8514979).

138824669 is a wasteful number, since it uses less digits than its factorization.

138824669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19395.

The product of its digits is 497664, while the sum is 47.

The square root of 138824669 is about 11782.3880856132. The cubic root of 138824669 is about 517.7922535697.

The spelling of 138824669 in words is "one hundred thirty-eight million, eight hundred twenty-four thousand, six hundred sixty-nine".