138758591 has 8 divisors (see below), whose sum is σ = 145898400. Its totient is φ = 131775840.

The previous prime is 138758569. The next prime is 138758603. The reversal of 138758591 is 195857831.

It is a happy number.

138758591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138758591 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138758491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37451 + ... + 40988.

It is an arithmetic number, because the mean of its divisors is an integer number (18237300).

Almost surely, 2^138758591 is an apocalyptic number.

138758591 is a deficient number, since it is larger than the sum of its proper divisors (7139809).

138758591 is an equidigital number, since it uses as much as digits as its factorization.

138758591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78529.

The product of its digits is 302400, while the sum is 47.

The square root of 138758591 is about 11779.5836513860. The cubic root of 138758591 is about 517.7100873219.

The spelling of 138758591 in words is "one hundred thirty-eight million, seven hundred fifty-eight thousand, five hundred ninety-one".