138306250 has 24 divisors (see below), whose sum is σ = 259319340. Its totient is φ = 55320000.

The previous prime is 138306247. The next prime is 138306277. The reversal of 138306250 is 52603831.

It can be written as a sum of positive squares in 6 ways, for example, as 549081 + 137757169 = 741^2 + 11737^2 .

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, 4815 + ... + 17314.

Almost surely, 2^138306250 is an apocalyptic number.

138306250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138306250 is a deficient number, since it is larger than the sum of its proper divisors (121013090).

138306250 is an frugal number, since it uses more digits than its factorization.

138306250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22156 (or 22136 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 138306250 is about 11760.3677663583. The cubic root of 138306250 is about 517.1469115472.

The spelling of 138306250 in words is "one hundred thirty-eight million, three hundred six thousand, two hundred fifty".