138871967 has 8 divisors (see below), whose sum is σ = 151448640. Its totient is φ = 126565920.

The previous prime is 138871949. The next prime is 138871973. The reversal of 138871967 is 769178831.

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

It is not a de Polignac number, because 138871967 - 2¹⁶ = 138806431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138871927) 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, 66584 + ... + 68637.

It is an arithmetic number, because the mean of its divisors is an integer number (18931080).

Almost surely, 2^138871967 is an apocalyptic number.

138871967 is a deficient number, since it is larger than the sum of its proper divisors (12576673).

138871967 is a wasteful number, since it uses less digits than its factorization.

138871967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135313.

The product of its digits is 508032, while the sum is 50.

The square root of 138871967 is about 11784.3950629636. The cubic root of 138871967 is about 517.8510513741.

The spelling of 138871967 in words is "one hundred thirty-eight million, eight hundred seventy-one thousand, nine hundred sixty-seven".