867520138 has 4 divisors (see below), whose sum is σ = 1301280210. Its totient is φ = 433760068.

The previous prime is 867520117. The next prime is 867520153. The reversal of 867520138 is 831025768.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 533471409 + 334048729 = 23097^2 + 18277^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 867520138.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 216880033 + ... + 216880036.

Almost surely, 2^867520138 is an apocalyptic number.

867520138 is a deficient number, since it is larger than the sum of its proper divisors (433760072).

867520138 is a wasteful number, since it uses less digits than its factorization.

867520138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433760071.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 867520138 is about 29453.6948106685. The cubic root of 867520138 is about 953.7323670908.

The spelling of 867520138 in words is "eight hundred sixty-seven million, five hundred twenty thousand, one hundred thirty-eight".