731424 has 48 divisors (see below), whose sum is σ = 2026080. Its totient is φ = 230400.

The previous prime is 731413. The next prime is 731447. The reversal of 731424 is 424137.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 731424.

It is an unprimeable number.

731424 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1624 + ... + 2024.

It is an arithmetic number, because the mean of its divisors is an integer number (42210).

2⁷³¹⁴²⁴ 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 731424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1013040).

731424 is an abundant number, since it is smaller than the sum of its proper divisors (1294656).

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

731424 is a wasteful number, since it uses less digits than its factorization.

731424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433 (or 425 counting only the distinct ones).

The product of its digits is 672, while the sum is 21.

The square root of 731424 is about 855.2333015032. The cubic root of 731424 is about 90.0996427271.

Adding to 731424 its sum of digits (21), we get a triangular number (731445 = T₁₂₀₉).

The spelling of 731424 in words is "seven hundred thirty-one thousand, four hundred twenty-four".