732821 has 4 divisors (see below), whose sum is σ = 736812. Its totient is φ = 728832.

The previous prime is 732817. The next prime is 732827. The reversal of 732821 is 128237.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70225 + 662596 = 265^2 + 814^2 .

It is a cyclic number.

It is not a de Polignac number, because 732821 - 2² = 732817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (732827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1706 + ... + 2091.

It is an arithmetic number, because the mean of its divisors is an integer number (184203).

2⁷³²⁸²¹ is an apocalyptic number.

It is an amenable number.

732821 is a deficient number, since it is larger than the sum of its proper divisors (3991).

732821 is a wasteful number, since it uses less digits than its factorization.

732821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3990.

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

The square root of 732821 is about 856.0496480929. The cubic root of 732821 is about 90.1569688700.

The spelling of 732821 in words is "seven hundred thirty-two thousand, eight hundred twenty-one".