861944 has 16 divisors (see below), whose sum is σ = 1628520. Its totient is φ = 427680.

The previous prime is 861941. The next prime is 861947. The reversal of 861944 is 449168.

It is an interprime number because it is at equal distance from previous prime (861941) and next prime (861947).

It is a self number, because there is not a number n which added to its sum of digits gives 861944.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861941) 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, 974 + ... + 1634.

2⁸⁶¹⁹⁴⁴ is an apocalyptic number.

It is an amenable number.

861944 is a deficient number, since it is larger than the sum of its proper divisors (766576).

861944 is a wasteful number, since it uses less digits than its factorization.

861944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830 (or 826 counting only the distinct ones).

The product of its digits is 6912, while the sum is 32.

The square root of 861944 is about 928.4093924557. The cubic root of 861944 is about 95.1684545814.

The spelling of 861944 in words is "eight hundred sixty-one thousand, nine hundred forty-four".