721038 has 16 divisors (see below), whose sum is σ = 1527120. Its totient is φ = 226176.

The previous prime is 721037. The next prime is 721043. The reversal of 721038 is 830127.

It is an alternating number because its digits alternate between odd and even.

It is a plaindrome in base 14.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 721038.

It is not an unprimeable number, because it can be changed into a prime (721037) by changing a digit.

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, 3433 + ... + 3636.

It is an arithmetic number, because the mean of its divisors is an integer number (95445).

2⁷²¹⁰³⁸ is an apocalyptic number.

721038 is an abundant number, since it is smaller than the sum of its proper divisors (806082).

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

721038 is a wasteful number, since it uses less digits than its factorization.

721038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7091.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 721038 is about 849.1395645004. The cubic root of 721038 is about 89.6711455285.

The spelling of 721038 in words is "seven hundred twenty-one thousand, thirty-eight".