138418187391 has 80 divisors (see below), whose sum is σ = 233321856768. Its totient is φ = 81046915200.

The previous prime is 138418187381. The next prime is 138418187417. The reversal of 138418187391 is 193781814831.

138418187391 is a `hidden beast` number, since 1 + 38 + 41 + 8 + 187 + 391 = 666.

It is not a de Polignac number, because 138418187391 - 2⁷ = 138418187263 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138418187351) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3744300 + ... + 3781086.

Almost surely, 2^138418187391 is an apocalyptic number.

138418187391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

138418187391 is a deficient number, since it is larger than the sum of its proper divisors (94903669377).

138418187391 is a wasteful number, since it uses less digits than its factorization.

138418187391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36954 (or 36945 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 54.

The spelling of 138418187391 in words is "one hundred thirty-eight billion, four hundred eighteen million, one hundred eighty-seven thousand, three hundred ninety-one".