861849 has 24 divisors (see below), whose sum is σ = 1359072. Its totient is φ = 524160.

The previous prime is 861829. The next prime is 861853. The reversal of 861849 is 948168.

It is a happy number.

861849 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 861849 - 2¹¹ = 859801 is a prime.

861849 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 861849.

It is not an unprimeable number, because it can be changed into a prime (861829) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6514 + ... + 6644.

It is an arithmetic number, because the mean of its divisors is an integer number (56628).

2⁸⁶¹⁸⁴⁹ is an apocalyptic number.

It is an amenable number.

861849 is a deficient number, since it is larger than the sum of its proper divisors (497223).

861849 is a wasteful number, since it uses less digits than its factorization.

861849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197 (or 194 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 861849 is about 928.3582282718. The cubic root of 861849 is about 95.1649580915.

The spelling of 861849 in words is "eight hundred sixty-one thousand, eight hundred forty-nine".