138213619 has 4 divisors (see below), whose sum is σ = 145488040. Its totient is φ = 130939200.

The previous prime is 138213613. The next prime is 138213643. The reversal of 138213619 is 916312831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 916312831 = 7 ⋅130901833.

It is a cyclic number.

It is not a de Polignac number, because 138213619 - 2²⁷ = 3995891 is a prime.

It is a super-2 number, since 2×138213619² = 38206008954154322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138213613) 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, 3637182 + ... + 3637219.

It is an arithmetic number, because the mean of its divisors is an integer number (36372010).

Almost surely, 2^138213619 is an apocalyptic number.

138213619 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

138213619 is a deficient number, since it is larger than the sum of its proper divisors (7274421).

138213619 is an equidigital number, since it uses as much as digits as its factorization.

138213619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7274420.

The product of its digits is 7776, while the sum is 34.

The square root of 138213619 is about 11756.4288370236. The cubic root of 138213619 is about 517.0314322295.

The spelling of 138213619 in words is "one hundred thirty-eight million, two hundred thirteen thousand, six hundred nineteen".