138676791 has 8 divisors (see below), whose sum is σ = 201711744. Its totient is φ = 84046520.

The previous prime is 138676789. The next prime is 138676807. The reversal of 138676791 is 197676831.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 138676791 - 2¹ = 138676789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138676791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138676711) 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, 2101131 + ... + 2101196.

It is an arithmetic number, because the mean of its divisors is an integer number (25213968).

Almost surely, 2^138676791 is an apocalyptic number.

138676791 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

138676791 is a deficient number, since it is larger than the sum of its proper divisors (63034953).

138676791 is a wasteful number, since it uses less digits than its factorization.

138676791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4202341.

The product of its digits is 381024, while the sum is 48.

The square root of 138676791 is about 11776.1110303869. Note that the first 3 decimals coincide. The cubic root of 138676791 is about 517.6083350405.

The spelling of 138676791 in words is "one hundred thirty-eight million, six hundred seventy-six thousand, seven hundred ninety-one".