138995950 has 24 divisors (see below), whose sum is σ = 261655128. Its totient is φ = 54926880.

The previous prime is 138995933. The next prime is 138995999. The reversal of 138995950 is 59599831.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 138995894 and 138995903.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 12597 + ... + 20896.

It is an arithmetic number, because the mean of its divisors is an integer number (10902297).

Almost surely, 2^138995950 is an apocalyptic number.

138995950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138995950 is a deficient number, since it is larger than the sum of its proper divisors (122659178).

138995950 is a wasteful number, since it uses less digits than its factorization.

138995950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33588 (or 33583 counting only the distinct ones).

The product of its (nonzero) digits is 437400, while the sum is 49.

The square root of 138995950 is about 11789.6543630422. The cubic root of 138995950 is about 518.0051156554.

The spelling of 138995950 in words is "one hundred thirty-eight million, nine hundred ninety-five thousand, nine hundred fifty".