138750993 has 12 divisors (see below), whose sum is σ = 207329460. Its totient is φ = 89310816.

The previous prime is 138750971. The next prime is 138751001. The reversal of 138750993 is 399057831.

It is a happy number.

138750993 is a `hidden beast` number, since 138 + 7 + 509 + 9 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 87385104 + 51365889 = 9348^2 + 7167^2 .

It is not a de Polignac number, because 138750993 - 2⁵ = 138750961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138750193) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 265546 + ... + 266067.

It is an arithmetic number, because the mean of its divisors is an integer number (17277455).

Almost surely, 2^138750993 is an apocalyptic number.

It is an amenable number.

138750993 is a deficient number, since it is larger than the sum of its proper divisors (68578467).

138750993 is a wasteful number, since it uses less digits than its factorization.

138750993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531648 (or 531645 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The square root of 138750993 is about 11779.2611398169. The cubic root of 138750993 is about 517.7006377375.

The spelling of 138750993 in words is "one hundred thirty-eight million, seven hundred fifty thousand, nine hundred ninety-three".