721402 has 16 divisors (see below), whose sum is σ = 1194624. Its totient is φ = 326700.

The previous prime is 721397. The next prime is 721439. The reversal of 721402 is 204127.

721402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2527 + ... + 2797.

It is an arithmetic number, because the mean of its divisors is an integer number (74664).

2⁷²¹⁴⁰² is an apocalyptic number.

721402 is a deficient number, since it is larger than the sum of its proper divisors (473222).

721402 is a wasteful number, since it uses less digits than its factorization.

721402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306 (or 284 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 721402 is about 849.3538720698. The cubic root of 721402 is about 89.6862324846.

Adding to 721402 its reverse (204127), we get a palindrome (925529).

The spelling of 721402 in words is "seven hundred twenty-one thousand, four hundred two", and thus it is an iban number.