731408 has 20 divisors (see below), whose sum is σ = 1501020. Its totient is φ = 344064.

The previous prime is 731389. The next prime is 731413. The reversal of 731408 is 804137.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 258064 + 473344 = 508^2 + 688^2 .

It is an unprimeable 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 3 ways as a sum of consecutive naturals, for example, 1073 + ... + 1616.

It is an arithmetic number, because the mean of its divisors is an integer number (75051).

2⁷³¹⁴⁰⁸ is an apocalyptic number.

It is an amenable number.

731408 is an abundant number, since it is smaller than the sum of its proper divisors (769612).

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

731408 is a wasteful number, since it uses less digits than its factorization.

731408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2714 (or 2708 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 731408 is about 855.2239472793. The cubic root of 731408 is about 90.0989857417.

The spelling of 731408 in words is "seven hundred thirty-one thousand, four hundred eight".