138422649 has 4 divisors (see below), whose sum is σ = 184563536. Its totient is φ = 92281764.

The previous prime is 138422629. The next prime is 138422651. The reversal of 138422649 is 946224831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 138422649 - 2⁵ = 138422617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138422629) 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, 23070439 + ... + 23070444.

It is an arithmetic number, because the mean of its divisors is an integer number (46140884).

Almost surely, 2^138422649 is an apocalyptic number.

It is an amenable number.

138422649 is a deficient number, since it is larger than the sum of its proper divisors (46140887).

138422649 is an equidigital number, since it uses as much as digits as its factorization.

138422649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46140886.

The product of its digits is 82944, while the sum is 39.

The square root of 138422649 is about 11765.3155078816. The cubic root of 138422649 is about 517.2919483872.

The spelling of 138422649 in words is "one hundred thirty-eight million, four hundred twenty-two thousand, six hundred forty-nine".