861307 has 4 divisors (see below), whose sum is σ = 863280. Its totient is φ = 859336.

The previous prime is 861299. The next prime is 861317. The reversal of 861307 is 703168.

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 861307 - 2³ = 861299 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 (861317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7 + ... + 1312.

It is an arithmetic number, because the mean of its divisors is an integer number (215820).

2⁸⁶¹³⁰⁷ is an apocalyptic number.

861307 is a deficient number, since it is larger than the sum of its proper divisors (1973).

861307 is a wasteful number, since it uses less digits than its factorization.

861307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1972.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 861307 is about 928.0662691856. The cubic root of 861307 is about 95.1450047805.

The spelling of 861307 in words is "eight hundred sixty-one thousand, three hundred seven".