138649958 has 16 divisors (see below), whose sum is σ = 210819024. Its totient is φ = 68382720.

The previous prime is 138649939. The next prime is 138649963. The reversal of 138649958 is 859946831.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53738 + ... + 56258.

It is an arithmetic number, because the mean of its divisors is an integer number (13176189).

Almost surely, 2^138649958 is an apocalyptic number.

138649958 is a deficient number, since it is larger than the sum of its proper divisors (72169066).

138649958 is a wasteful number, since it uses less digits than its factorization.

138649958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2887.

The product of its digits is 1866240, while the sum is 53.

The square root of 138649958 is about 11774.9716772483. The cubic root of 138649958 is about 517.5749483427.

The spelling of 138649958 in words is "one hundred thirty-eight million, six hundred forty-nine thousand, nine hundred fifty-eight".