867542123 has 4 divisors (see below), whose sum is σ = 991476720. Its totient is φ = 743607528.

The previous prime is 867542111. The next prime is 867542131. The reversal of 867542123 is 321245768.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 867542123 - 2⁶ = 867542059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (867542173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61967288 + ... + 61967301.

It is an arithmetic number, because the mean of its divisors is an integer number (247869180).

Almost surely, 2^867542123 is an apocalyptic number.

867542123 is a deficient number, since it is larger than the sum of its proper divisors (123934597).

867542123 is a wasteful number, since it uses less digits than its factorization.

867542123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123934596.

The product of its digits is 80640, while the sum is 38.

The square root of 867542123 is about 29454.0680212428. The cubic root of 867542123 is about 953.7404236296.

The spelling of 867542123 in words is "eight hundred sixty-seven million, five hundred forty-two thousand, one hundred twenty-three".