721401 has 8 divisors (see below), whose sum is σ = 993024. Its totient is φ = 465360.

The previous prime is 721397. The next prime is 721439. The reversal of 721401 is 104127.

721401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 721401 - 2² = 721397 is a prime.

It is not an unprimeable number, because it can be changed into a prime (721451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3786 + ... + 3971.

It is an arithmetic number, because the mean of its divisors is an integer number (124128).

2⁷²¹⁴⁰¹ is an apocalyptic number.

It is an amenable number.

721401 is a deficient number, since it is larger than the sum of its proper divisors (271623).

721401 is a wasteful number, since it uses less digits than its factorization.

721401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7791.

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 721401 is about 849.3532833868. The cubic root of 721401 is about 89.6861910439.

Adding to 721401 its reverse (104127), we get a palindrome (825528).

The spelling of 721401 in words is "seven hundred twenty-one thousand, four hundred one", and thus it is an iban number.