138649982 has 8 divisors (see below), whose sum is σ = 209124552. Its totient is φ = 68941800.

The previous prime is 138649981. The next prime is 138649993. The reversal of 138649982 is 289946831.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 138649982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138649981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191144 + ... + 191867.

It is an arithmetic number, because the mean of its divisors is an integer number (26140569).

Almost surely, 2^138649982 is an apocalyptic number.

138649982 is a deficient number, since it is larger than the sum of its proper divisors (70474570).

138649982 is a wasteful number, since it uses less digits than its factorization.

138649982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383194.

The product of its digits is 746496, while the sum is 50.

The square root of 138649982 is about 11774.9726963590. The cubic root of 138649982 is about 517.5749782064.

The spelling of 138649982 in words is "one hundred thirty-eight million, six hundred forty-nine thousand, nine hundred eighty-two".