138448817 has 4 divisors (see below), whose sum is σ = 149098740. Its totient is φ = 127798896.

The previous prime is 138448811. The next prime is 138448819. The reversal of 138448817 is 718844831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18524416 + 119924401 = 4304^2 + 10951^2 .

It is a cyclic number.

It is not a de Polignac number, because 138448817 - 2¹² = 138444721 is a prime.

It is a super-4 number, since 4×138448817⁴ (a number of 34 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138448811) 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 3 ways as a sum of consecutive naturals, for example, 5324942 + ... + 5324967.

It is an arithmetic number, because the mean of its divisors is an integer number (37274685).

Almost surely, 2^138448817 is an apocalyptic number.

It is an amenable number.

138448817 is a deficient number, since it is larger than the sum of its proper divisors (10649923).

138448817 is a wasteful number, since it uses less digits than its factorization.

138448817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10649922.

The product of its digits is 172032, while the sum is 44.

The square root of 138448817 is about 11766.4275377023. The cubic root of 138448817 is about 517.3245433488.

The spelling of 138448817 in words is "one hundred thirty-eight million, four hundred forty-eight thousand, eight hundred seventeen".