138555213 has 8 divisors (see below), whose sum is σ = 190699776. Its totient is φ = 89390400.

The previous prime is 138555211. The next prime is 138555227. The reversal of 138555213 is 312555831.

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

It is not a de Polignac number, because 138555213 - 2¹ = 138555211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138555211) 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, 744828 + ... + 745013.

It is an arithmetic number, because the mean of its divisors is an integer number (23837472).

Almost surely, 2^138555213 is an apocalyptic number.

It is an amenable number.

138555213 is a deficient number, since it is larger than the sum of its proper divisors (52144563).

138555213 is a wasteful number, since it uses less digits than its factorization.

138555213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1489875.

The product of its digits is 18000, while the sum is 33.

The square root of 138555213 is about 11770.9478377911. The cubic root of 138555213 is about 517.4570283346.

The spelling of 138555213 in words is "one hundred thirty-eight million, five hundred fifty-five thousand, two hundred thirteen".