138848691 has 4 divisors (see below), whose sum is σ = 185131592. Its totient is φ = 92565792.

The previous prime is 138848687. The next prime is 138848693. The reversal of 138848691 is 196848831.

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

It is not a de Polignac number, because 138848691 - 2² = 138848687 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138848691.

It is not an unprimeable number, because it can be changed into a prime (138848693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23141446 + ... + 23141451.

It is an arithmetic number, because the mean of its divisors is an integer number (46282898).

Almost surely, 2^138848691 is an apocalyptic number.

138848691 is a deficient number, since it is larger than the sum of its proper divisors (46282901).

138848691 is an equidigital number, since it uses as much as digits as its factorization.

138848691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46282900.

The product of its digits is 331776, while the sum is 48.

The square root of 138848691 is about 11783.4074443685. The cubic root of 138848691 is about 517.8221178300.

The spelling of 138848691 in words is "one hundred thirty-eight million, eight hundred forty-eight thousand, six hundred ninety-one".