861042 has 64 divisors (see below), whose sum is σ = 2257920. Its totient is φ = 212544.

The previous prime is 861037. The next prime is 861043. The reversal of 861042 is 240168.

861042 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (861043) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10333 + ... + 10415.

It is an arithmetic number, because the mean of its divisors is an integer number (35280).

2⁸⁶¹⁰⁴² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 861042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1128960).

861042 is an abundant number, since it is smaller than the sum of its proper divisors (1396878).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

861042 is a wasteful number, since it uses less digits than its factorization.

861042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 861042 is about 927.9234882252. The cubic root of 861042 is about 95.1352459633.

It can be divided in two parts, 86 and 1042, that added together give a triangular number (1128 = T₄₇).

The spelling of 861042 in words is "eight hundred sixty-one thousand, forty-two".