138776593 has 4 divisors (see below), whose sum is σ = 146939940. Its totient is φ = 130613248.

The previous prime is 138776579. The next prime is 138776611. The reversal of 138776593 is 395677831.

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 48678529 + 90098064 = 6977^2 + 9492^2 .

It is a cyclic number.

It is not a de Polignac number, because 138776593 - 2²¹ = 136679441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138776993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4081648 + ... + 4081681.

It is an arithmetic number, because the mean of its divisors is an integer number (36734985).

Almost surely, 2^138776593 is an apocalyptic number.

It is an amenable number.

138776593 is a deficient number, since it is larger than the sum of its proper divisors (8163347).

138776593 is an equidigital number, since it uses as much as digits as its factorization.

138776593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8163346.

The product of its digits is 952560, while the sum is 49.

The square root of 138776593 is about 11780.3477452917. The cubic root of 138776593 is about 517.7324749182.

The spelling of 138776593 in words is "one hundred thirty-eight million, seven hundred seventy-six thousand, five hundred ninety-three".