138621411 has 6 divisors (see below), whose sum is σ = 200230940. Its totient is φ = 92414268.

The previous prime is 138621403. The next prime is 138621419. The reversal of 138621411 is 114126831.

It is a happy number.

138621411 is a `hidden beast` number, since 1 + 38 + 621 + 4 + 1 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (138621403) and next prime (138621419).

It is not a de Polignac number, because 138621411 - 2³ = 138621403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138621419) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7701181 + ... + 7701198.

Almost surely, 2^138621411 is an apocalyptic number.

138621411 is a deficient number, since it is larger than the sum of its proper divisors (61609529).

138621411 is a wasteful number, since it uses less digits than its factorization.

138621411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15402385 (or 15402382 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 138621411 is about 11773.7594250944. The cubic root of 138621411 is about 517.5394242877.

The spelling of 138621411 in words is "one hundred thirty-eight million, six hundred twenty-one thousand, four hundred eleven".