138611919 has 8 divisors (see below), whose sum is σ = 189114112. Its totient is φ = 90258840.

The previous prime is 138611917. The next prime is 138611923. The reversal of 138611919 is 919116831.

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

It is not a de Polignac number, because 138611919 - 2¹ = 138611917 is a prime.

It is a super-2 number, since 2×138611919² = 38426528177725122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138611911) 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, 537127 + ... + 537384.

It is an arithmetic number, because the mean of its divisors is an integer number (23639264).

Almost surely, 2^138611919 is an apocalyptic number.

138611919 is a deficient number, since it is larger than the sum of its proper divisors (50502193).

138611919 is a wasteful number, since it uses less digits than its factorization.

138611919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1074557.

The product of its digits is 11664, while the sum is 39.

The square root of 138611919 is about 11773.3563183996. The cubic root of 138611919 is about 517.5276113065.

The spelling of 138611919 in words is "one hundred thirty-eight million, six hundred eleven thousand, nine hundred nineteen".