138212450 has 24 divisors (see below), whose sum is σ = 258964452. Its totient is φ = 54878720.

The previous prime is 138212423. The next prime is 138212471. The reversal of 138212450 is 54212831.

It can be written as a sum of positive squares in 6 ways, for example, as 69372241 + 68840209 = 8329^2 + 8297^2 .

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, 3239 + ... + 16938.

Almost surely, 2^138212450 is an apocalyptic number.

138212450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138212450 is a deficient number, since it is larger than the sum of its proper divisors (120752002).

138212450 is a wasteful number, since it uses less digits than its factorization.

138212450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20326 (or 20321 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 138212450 is about 11756.3791194398. The cubic root of 138212450 is about 517.0299745549.

The spelling of 138212450 in words is "one hundred thirty-eight million, two hundred twelve thousand, four hundred fifty".