721263 has 4 divisors (see below), whose sum is σ = 961688. Its totient is φ = 480840.

The previous prime is 721261. The next prime is 721267. The reversal of 721263 is 362127.

It is a happy number.

721263 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 362127 = 3 ⋅120709.

It is not a de Polignac number, because 721263 - 2¹ = 721261 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120208 + ... + 120213.

It is an arithmetic number, because the mean of its divisors is an integer number (240422).

2⁷²¹²⁶³ is an apocalyptic number.

721263 is a deficient number, since it is larger than the sum of its proper divisors (240425).

721263 is a wasteful number, since it uses less digits than its factorization.

721263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240424.

The product of its digits is 504, while the sum is 21.

The square root of 721263 is about 849.2720412212. The cubic root of 721263 is about 89.6804718560.

It can be divided in two parts, 7 and 21263, that multiplied together give a palindrome (148841).

The spelling of 721263 in words is "seven hundred twenty-one thousand, two hundred sixty-three".