138649962 has 32 divisors (see below), whose sum is σ = 305300160. Its totient is φ = 41627520.

The previous prime is 138649939. The next prime is 138649963. The reversal of 138649962 is 269946831.

It is not an unprimeable number, because it can be changed into a prime (138649963) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2443 + ... + 16830.

It is an arithmetic number, because the mean of its divisors is an integer number (9540630).

Almost surely, 2^138649962 is an apocalyptic number.

138649962 is an abundant number, since it is smaller than the sum of its proper divisors (166650198).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138649962 is a wasteful number, since it uses less digits than its factorization.

138649962 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19398.

The product of its digits is 559872, while the sum is 48.

The square root of 138649962 is about 11774.9718471001. The cubic root of 138649962 is about 517.5749533200.

The spelling of 138649962 in words is "one hundred thirty-eight million, six hundred forty-nine thousand, nine hundred sixty-two".