138547971 has 6 divisors (see below), whose sum is σ = 200124860. Its totient is φ = 92365308.

The previous prime is 138547957. The next prime is 138547973. The reversal of 138547971 is 179745831.

138547971 is a `hidden beast` number, since 1 + 38 + 547 + 9 + 71 = 666.

It is not a de Polignac number, because 138547971 - 2¹¹ = 138545923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138547973) 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, 7697101 + ... + 7697118.

Almost surely, 2^138547971 is an apocalyptic number.

138547971 is a deficient number, since it is larger than the sum of its proper divisors (61576889).

138547971 is a wasteful number, since it uses less digits than its factorization.

138547971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15394225 (or 15394222 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 138547971 is about 11770.6402119851. The cubic root of 138547971 is about 517.4480127010.

The spelling of 138547971 in words is "one hundred thirty-eight million, five hundred forty-seven thousand, nine hundred seventy-one".