138750530 has 16 divisors (see below), whose sum is σ = 250094520. Its totient is φ = 55423872.

The previous prime is 138750523. The next prime is 138750581. The reversal of 138750530 is 35057831.

It can be written as a sum of positive squares in 4 ways, for example, as 117137329 + 21613201 = 10823^2 + 4649^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1595 + ... + 16734.

Almost surely, 2^138750530 is an apocalyptic number.

138750530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138750530 is a deficient number, since it is larger than the sum of its proper divisors (111343990).

138750530 is a wasteful number, since it uses less digits than its factorization.

138750530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19093.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 138750530 is about 11779.2414866153. The cubic root of 138750530 is about 517.7000618962.

The spelling of 138750530 in words is "one hundred thirty-eight million, seven hundred fifty thousand, five hundred thirty".