138205250 has 16 divisors (see below), whose sum is σ = 258720696. Its totient is φ = 55282000.

The previous prime is 138205247. The next prime is 138205253. The reversal of 138205250 is 52502831.

It is an interprime number because it is at equal distance from previous prime (138205247) and next prime (138205253).

It can be written as a sum of positive squares in 4 ways, for example, as 27050401 + 111154849 = 5201^2 + 10543^2 .

It is a super-2 number, since 2×138205250² = 38201382255125000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138205253) 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 7 ways as a sum of consecutive naturals, for example, 276161 + ... + 276660.

Almost surely, 2^138205250 is an apocalyptic number.

138205250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138205250 is a deficient number, since it is larger than the sum of its proper divisors (120515446).

138205250 is an equidigital number, since it uses as much as digits as its factorization.

138205250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552838 (or 552828 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 138205250 is about 11756.0728987192. The cubic root of 138205250 is about 517.0209963950.

The spelling of 138205250 in words is "one hundred thirty-eight million, two hundred five thousand, two hundred fifty".