864139007 has 4 divisors (see below), whose sum is σ = 866615400. Its totient is φ = 861662616.

The previous prime is 864138973. The next prime is 864139009. The reversal of 864139007 is 700931468.

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 864139007 - 2¹² = 864134911 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 (864139009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1237673 + ... + 1238370.

It is an arithmetic number, because the mean of its divisors is an integer number (216653850).

Almost surely, 2^864139007 is an apocalyptic number.

864139007 is a deficient number, since it is larger than the sum of its proper divisors (2476393).

864139007 is a wasteful number, since it uses less digits than its factorization.

864139007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2476392.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 864139007 is about 29396.2413753868. The cubic root of 864139007 is about 952.4917071127.

The spelling of 864139007 in words is "eight hundred sixty-four million, one hundred thirty-nine thousand, seven".