138888250 has 32 divisors (see below), whose sum is σ = 268978320. Its totient is φ = 53636800.

The previous prime is 138888227. The next prime is 138888257. The reversal of 138888250 is 52888831.

It can be written as a sum of positive squares in 8 ways, for example, as 1787569 + 137100681 = 1337^2 + 11709^2 .

It is a junction number, because it is equal to n+sod(n) for n = 138888197 and 138888206.

It is not an unprimeable number, because it can be changed into a prime (138888257) 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, 2329 + ... + 16828.

Almost surely, 2^138888250 is an apocalyptic number.

138888250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138888250 is a deficient number, since it is larger than the sum of its proper divisors (130090070).

138888250 is a wasteful number, since it uses less digits than its factorization.

138888250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19203 (or 19193 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 43.

The square root of 138888250 is about 11785.0859139847. The cubic root of 138888250 is about 517.8712902539.

The spelling of 138888250 in words is "one hundred thirty-eight million, eight hundred eighty-eight thousand, two hundred fifty".