721413 has 32 divisors (see below), whose sum is σ = 1336320. Its totient is φ = 373680.

The previous prime is 721397. The next prime is 721439. The reversal of 721413 is 314127.

It is not a de Polignac number, because 721413 - 2⁴ = 721397 is a prime.

It is a Curzon number.

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 721413.

It is not an unprimeable number, because it can be changed into a prime (721013) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1906 + ... + 2252.

It is an arithmetic number, because the mean of its divisors is an integer number (41760).

2⁷²¹⁴¹³ is an apocalyptic number.

It is an amenable number.

721413 is a deficient number, since it is larger than the sum of its proper divisors (614907).

721413 is a wasteful number, since it uses less digits than its factorization.

721413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374 (or 368 counting only the distinct ones).

The product of its digits is 168, while the sum is 18.

The square root of 721413 is about 849.3603475557. The cubic root of 721413 is about 89.6866883301.

It can be divided in two parts, 7214 and 13, that added together give a palindrome (7227).

The spelling of 721413 in words is "seven hundred twenty-one thousand, four hundred thirteen".