861552 has 60 divisors (see below), whose sum is σ = 2501824. Its totient is φ = 276480.

The previous prime is 861551. The next prime is 861559. The reversal of 861552 is 255168.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4368 + ... + 4560.

2⁸⁶¹⁵⁵² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 861552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1250912).

861552 is an abundant number, since it is smaller than the sum of its proper divisors (1640272).

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

861552 is a wasteful number, since it uses less digits than its factorization.

861552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238 (or 229 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 861552 is about 928.1982546848. The cubic root of 861552 is about 95.1540253025.

The spelling of 861552 in words is "eight hundred sixty-one thousand, five hundred fifty-two".