861699 has 4 divisors (see below), whose sum is σ = 1148936. Its totient is φ = 574464.

The previous prime is 861691. The next prime is 861701. The reversal of 861699 is 996168.

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

It is not a de Polignac number, because 861699 - 2³ = 861691 is a prime.

It is a D-number.

It is a Duffinian number.

861699 is a lucky number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143614 + ... + 143619.

It is an arithmetic number, because the mean of its divisors is an integer number (287234).

2⁸⁶¹⁶⁹⁹ is an apocalyptic number.

861699 is a deficient number, since it is larger than the sum of its proper divisors (287237).

861699 is a wasteful number, since it uses less digits than its factorization.

861699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287236.

The product of its digits is 23328, while the sum is 39.

The square root of 861699 is about 928.2774369767. The cubic root of 861699 is about 95.1594367949.

The spelling of 861699 in words is "eight hundred sixty-one thousand, six hundred ninety-nine".