861693 has 16 divisors (see below), whose sum is σ = 1349760. Its totient is φ = 478656.

The previous prime is 861691. The next prime is 861701. The reversal of 861693 is 396168.

It is not a de Polignac number, because 861693 - 2¹ = 861691 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 223 + ... + 1331.

It is an arithmetic number, because the mean of its divisors is an integer number (84360).

2⁸⁶¹⁶⁹³ is an apocalyptic number.

It is an amenable number.

861693 is a deficient number, since it is larger than the sum of its proper divisors (488067).

861693 is a wasteful number, since it uses less digits than its factorization.

861693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1156.

The product of its digits is 7776, while the sum is 33.

The square root of 861693 is about 928.2742051786. The cubic root of 861693 is about 95.1592159297.

The spelling of 861693 in words is "eight hundred sixty-one thousand, six hundred ninety-three".