721052 has 6 divisors (see below), whose sum is σ = 1261848. Its totient is φ = 360524.

The previous prime is 721051. The next prime is 721057. The reversal of 721052 is 250127.

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

It is a self number, because there is not a number n which added to its sum of digits gives 721052.

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 721052.

It is not an unprimeable number, because it can be changed into a prime (721051) 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 as a sum of consecutive naturals, namely, 90128 + ... + 90135.

It is an arithmetic number, because the mean of its divisors is an integer number (210308).

2⁷²¹⁰⁵² is an apocalyptic number.

It is an amenable number.

721052 is a deficient number, since it is larger than the sum of its proper divisors (540796).

721052 is a wasteful number, since it uses less digits than its factorization.

721052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180267 (or 180265 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 721052 is about 849.1478080994. The cubic root of 721052 is about 89.6717258899.

Adding to 721052 its reverse (250127), we get a palindrome (971179).

The spelling of 721052 in words is "seven hundred twenty-one thousand, fifty-two".