721359 has 8 divisors (see below), whose sum is σ = 1068720. Its totient is φ = 480888.

The previous prime is 721351. The next prime is 721363. The reversal of 721359 is 953127.

721359 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 721359 - 2³ = 721351 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 26717 = 721359 / (7 + 2 + 1 + 3 + 5 + 9).

It is an Ulam number.

721359 is a lucky 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 721359.

It is not an unprimeable number, because it can be changed into a prime (721351) 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, 13332 + ... + 13385.

It is an arithmetic number, because the mean of its divisors is an integer number (133590).

2⁷²¹³⁵⁹ is an apocalyptic number.

721359 is a deficient number, since it is larger than the sum of its proper divisors (347361).

721359 is a wasteful number, since it uses less digits than its factorization.

721359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26726 (or 26720 counting only the distinct ones).

The product of its digits is 1890, while the sum is 27.

The square root of 721359 is about 849.3285583330. The cubic root of 721359 is about 89.6844504987.

It can be divided in two parts, 72 and 1359, that added together give a triangular number (1431 = T₅₃).

The spelling of 721359 in words is "seven hundred twenty-one thousand, three hundred fifty-nine".