721446 has 32 divisors (see below), whose sum is σ = 1669248. Its totient is φ = 205440.

The previous prime is 721439. The next prime is 721451. The reversal of 721446 is 644127.

It is a congruent number.

It is an unprimeable number.

721446 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 15 ways as a sum of consecutive naturals, for example, 801 + ... + 1443.

It is an arithmetic number, because the mean of its divisors is an integer number (52164).

2⁷²¹⁴⁴⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721446, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (834624).

721446 is an abundant number, since it is smaller than the sum of its proper divisors (947802).

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

721446 is a wasteful number, since it uses less digits than its factorization.

721446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676.

The product of its digits is 1344, while the sum is 24.

The square root of 721446 is about 849.3797737173. The cubic root of 721446 is about 89.6880558388.

It can be divided in two parts, 7214 and 46, that added together give a triangular number (7260 = T₁₂₀).

The spelling of 721446 in words is "seven hundred twenty-one thousand, four hundred forty-six".