138872091 has 8 divisors (see below), whose sum is σ = 193213440. Its totient is φ = 88556072.

The previous prime is 138872081. The next prime is 138872093. The reversal of 138872091 is 190278831.

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

It is not a de Polignac number, because 138872091 - 2¹⁷ = 138741019 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138872093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1006251 + ... + 1006388.

It is an arithmetic number, because the mean of its divisors is an integer number (24151680).

Almost surely, 2^138872091 is an apocalyptic number.

138872091 is a deficient number, since it is larger than the sum of its proper divisors (54341349).

138872091 is a wasteful number, since it uses less digits than its factorization.

138872091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2012665.

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 138872091 is about 11784.4003241574. The cubic root of 138872091 is about 517.8512055053.

The spelling of 138872091 in words is "one hundred thirty-eight million, eight hundred seventy-two thousand, ninety-one".