731856 has 40 divisors (see below), whose sum is σ = 1924480. Its totient is φ = 239616.

The previous prime is 731851. The next prime is 731869. The reversal of 731856 is 658137.

It is a super-2 number, since 2×731856² = 1071226409472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (731851) by changing a digit.

731856 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3696 + ... + 3888.

It is an arithmetic number, because the mean of its divisors is an integer number (48112).

2⁷³¹⁸⁵⁶ 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 731856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (962240).

731856 is an abundant number, since it is smaller than the sum of its proper divisors (1192624).

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

731856 is a wasteful number, since it uses less digits than its factorization.

731856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283 (or 277 counting only the distinct ones).

The product of its digits is 5040, while the sum is 30.

The square root of 731856 is about 855.4858268843. The cubic root of 731856 is about 90.1173777140.

The spelling of 731856 in words is "seven hundred thirty-one thousand, eight hundred fifty-six".