138874971 has 16 divisors (see below), whose sum is σ = 195171840. Its totient is φ = 87593760.

The previous prime is 138874963. The next prime is 138874973. The reversal of 138874971 is 179478831.

It is not a de Polignac number, because 138874971 - 2³ = 138874963 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138874971.

It is not an unprimeable number, because it can be changed into a prime (138874973) 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 15 ways as a sum of consecutive naturals, for example, 66286 + ... + 68348.

It is an arithmetic number, because the mean of its divisors is an integer number (12198240).

Almost surely, 2^138874971 is an apocalyptic number.

138874971 is a deficient number, since it is larger than the sum of its proper divisors (56296869).

138874971 is a wasteful number, since it uses less digits than its factorization.

138874971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3266.

The product of its digits is 338688, while the sum is 48.

The square root of 138874971 is about 11784.5225189653. The cubic root of 138874971 is about 517.8547853011.

The spelling of 138874971 in words is "one hundred thirty-eight million, eight hundred seventy-four thousand, nine hundred seventy-one".