138778750 has 40 divisors (see below), whose sum is σ = 283802904. Its totient is φ = 50460000.

The previous prime is 138778729. The next prime is 138778763. The reversal of 138778750 is 57877831.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 138778750.

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 19 ways as a sum of consecutive naturals, for example, 8704 + ... + 18796.

Almost surely, 2^138778750 is an apocalyptic number.

138778750 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138778750 is an abundant number, since it is smaller than the sum of its proper divisors (145024154).

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

138778750 is a wasteful number, since it uses less digits than its factorization.

138778750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10126 (or 10111 counting only the distinct ones).

The product of its (nonzero) digits is 329280, while the sum is 46.

The square root of 138778750 is about 11780.4392957139. The cubic root of 138778750 is about 517.7351572706.

The spelling of 138778750 in words is "one hundred thirty-eight million, seven hundred seventy-eight thousand, seven hundred fifty".