138408219 has 24 divisors (see below), whose sum is σ = 203636160. Its totient is φ = 90571392.

The previous prime is 138408197. The next prime is 138408229. The reversal of 138408219 is 912804831.

138408219 is a `hidden beast` number, since 1 + 38 + 408 + 219 = 666.

It is not a de Polignac number, because 138408219 - 2¹¹ = 138406171 is a prime.

It is a super-2 number, since 2×138408219² = 38313670173503922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138408229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 192142 + ... + 192860.

It is an arithmetic number, because the mean of its divisors is an integer number (8484840).

Almost surely, 2^138408219 is an apocalyptic number.

138408219 is a deficient number, since it is larger than the sum of its proper divisors (65227941).

138408219 is a wasteful number, since it uses less digits than its factorization.

138408219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091 (or 1088 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 138408219 is about 11764.7022486759. The cubic root of 138408219 is about 517.2739725664.

The spelling of 138408219 in words is "one hundred thirty-eight million, four hundred eight thousand, two hundred nineteen".