731250 has 72 divisors (see below), whose sum is σ = 2132676. Its totient is φ = 180000.

The previous prime is 731249. The next prime is 731251. The reversal of 731250 is 52137.

It is an interprime number because it is at equal distance from previous prime (731249) and next prime (731251).

It can be written as a sum of positive squares in 6 ways, for example, as 199809 + 531441 = 447^2 + 729^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (731251) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 56244 + ... + 56256.

731250 is a Friedman number, since it can be written as 130*75^2, using all its digits and the basic arithmetic operations.

2⁷³¹²⁵⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 731250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1066338).

731250 is an abundant number, since it is smaller than the sum of its proper divisors (1401426).

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

731250 is a wasteful number, since it uses less digits than its factorization.

731250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46 (or 23 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 18.

The square root of 731250 is about 855.1315688244. The cubic root of 731250 is about 90.0924974957.

Adding to 731250 its reverse (52137), we get a palindrome (783387).

The spelling of 731250 in words is "seven hundred thirty-one thousand, two hundred fifty".