138871619 has 4 divisors (see below), whose sum is σ = 142624944. Its totient is φ = 135118296.

The previous prime is 138871613. The next prime is 138871643. The reversal of 138871619 is 916178831.

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 138871619 - 2⁸ = 138871363 is a prime.

It is a super-2 number, since 2×138871619² = 38570653127362322, which contains 22 as substring.

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 138871619.

It is not an unprimeable number, because it can be changed into a prime (138871613) 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, 1876607 + ... + 1876680.

It is an arithmetic number, because the mean of its divisors is an integer number (35656236).

Almost surely, 2^138871619 is an apocalyptic number.

138871619 is a deficient number, since it is larger than the sum of its proper divisors (3753325).

138871619 is an equidigital number, since it uses as much as digits as its factorization.

138871619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3753324.

The product of its digits is 72576, while the sum is 44.

The square root of 138871619 is about 11784.3802976652. The cubic root of 138871619 is about 517.8506188119.

The spelling of 138871619 in words is "one hundred thirty-eight million, eight hundred seventy-one thousand, six hundred nineteen".