721338 has 8 divisors (see below), whose sum is σ = 1442688. Its totient is φ = 240444.

The previous prime is 721337. The next prime is 721351. The reversal of 721338 is 833127.

It is a sphenic number, since it is the product of 3 distinct primes.

721338 is an admirable number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 721338.

It is not an unprimeable number, because it can be changed into a prime (721333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60106 + ... + 60117.

It is an arithmetic number, because the mean of its divisors is an integer number (180336).

2⁷²¹³³⁸ is an apocalyptic number.

721338 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

721338 is a wasteful number, since it uses less digits than its factorization.

721338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120228.

The product of its digits is 1008, while the sum is 24.

The square root of 721338 is about 849.3161955362. The cubic root of 721338 is about 89.6835802008.

The spelling of 721338 in words is "seven hundred twenty-one thousand, three hundred thirty-eight".