138509950 has 12 divisors (see below), whose sum is σ = 257628600. Its totient is φ = 55403960.

The previous prime is 138509927. The next prime is 138509951. The reversal of 138509950 is 59905831.

138509950 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138509951) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1385050 + ... + 1385149.

It is an arithmetic number, because the mean of its divisors is an integer number (21469050).

Almost surely, 2^138509950 is an apocalyptic number.

138509950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138509950 is a deficient number, since it is larger than the sum of its proper divisors (119118650).

138509950 is a wasteful number, since it uses less digits than its factorization.

138509950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2770211 (or 2770206 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 40.

The square root of 138509950 is about 11769.0250233399. The cubic root of 138509950 is about 517.4006748471.

The spelling of 138509950 in words is "one hundred thirty-eight million, five hundred nine thousand, nine hundred fifty".