138409982 has 8 divisors (see below), whose sum is σ = 214774200. Its totient is φ = 66818584.

The previous prime is 138409963. The next prime is 138410017. The reversal of 138409982 is 289904831.

It is a happy number.

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

It is a congruent number.

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, 1193132 + ... + 1193247.

It is an arithmetic number, because the mean of its divisors is an integer number (26846775).

Almost surely, 2^138409982 is an apocalyptic number.

138409982 is a deficient number, since it is larger than the sum of its proper divisors (76364218).

138409982 is a wasteful number, since it uses less digits than its factorization.

138409982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2386410.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 138409982 is about 11764.7771759605. Note that the first 3 decimals coincide. The cubic root of 138409982 is about 517.2761688476.

The spelling of 138409982 in words is "one hundred thirty-eight million, four hundred nine thousand, nine hundred eighty-two".