138891850 has 12 divisors (see below), whose sum is σ = 258338934. Its totient is φ = 55556720.

The previous prime is 138891847. The next prime is 138891859. The reversal of 138891850 is 58198831.

It can be written as a sum of positive squares in 3 ways, for example, as 50851161 + 88040689 = 7131^2 + 9383^2 .

It is a junction number, because it is equal to n+sod(n) for n = 138891797 and 138891806.

It is not an unprimeable number, because it can be changed into a prime (138891859) 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 5 ways as a sum of consecutive naturals, for example, 1388869 + ... + 1388968.

Almost surely, 2^138891850 is an apocalyptic number.

138891850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138891850 is a deficient number, since it is larger than the sum of its proper divisors (119447084).

138891850 is a wasteful number, since it uses less digits than its factorization.

138891850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2777849 (or 2777844 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 43.

The square root of 138891850 is about 11785.2386484110. The cubic root of 138891850 is about 517.8757646438.

The spelling of 138891850 in words is "one hundred thirty-eight million, eight hundred ninety-one thousand, eight hundred fifty".