138148919 has 4 divisors (see below), whose sum is σ = 146275344. Its totient is φ = 130022496.

The previous prime is 138148897. The next prime is 138148921. The reversal of 138148919 is 919841831.

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

It is a cyclic number.

It is not a de Polignac number, because 138148919 - 2²⁰ = 137100343 is a prime.

It is a super-2 number, since 2×138148919² = 38170247641737122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 138148919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138148939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4063187 + ... + 4063220.

It is an arithmetic number, because the mean of its divisors is an integer number (36568836).

Almost surely, 2^138148919 is an apocalyptic number.

138148919 is a deficient number, since it is larger than the sum of its proper divisors (8126425).

138148919 is an equidigital number, since it uses as much as digits as its factorization.

138148919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8126424.

The product of its digits is 62208, while the sum is 44.

The square root of 138148919 is about 11753.6768289757. The cubic root of 138148919 is about 516.9507427503.

The spelling of 138148919 in words is "one hundred thirty-eight million, one hundred forty-eight thousand, nine hundred nineteen".