721416 has 16 divisors (see below), whose sum is σ = 1803600. Its totient is φ = 240464.

The previous prime is 721397. The next prime is 721439. The reversal of 721416 is 614127.

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

It is a junction number, because it is equal to n+sod(n) for n = 721392 and 721401.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 721416.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15006 + ... + 15053.

It is an arithmetic number, because the mean of its divisors is an integer number (112725).

2⁷²¹⁴¹⁶ is an apocalyptic number.

It is an amenable number.

721416 is an abundant number, since it is smaller than the sum of its proper divisors (1082184).

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

721416 is a wasteful number, since it uses less digits than its factorization.

721416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30068 (or 30064 counting only the distinct ones).

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

The square root of 721416 is about 849.3621135888. The cubic root of 721416 is about 89.6868126508.

The spelling of 721416 in words is "seven hundred twenty-one thousand, four hundred sixteen".