721395 has 48 divisors (see below), whose sum is σ = 1415232. Its totient is φ = 337920.

The previous prime is 721387. The next prime is 721397. The reversal of 721395 is 593127.

721395 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 721395 - 2³ = 721387 is a prime.

721395 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 721395.

It is not an unprimeable number, because it can be changed into a prime (721397) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17575 + ... + 17615.

It is an arithmetic number, because the mean of its divisors is an integer number (29484).

2⁷²¹³⁹⁵ is an apocalyptic number.

721395 is a deficient number, since it is larger than the sum of its proper divisors (693837).

721395 is a wasteful number, since it uses less digits than its factorization.

721395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92 (or 89 counting only the distinct ones).

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

The square root of 721395 is about 849.3497512804. The cubic root of 721395 is about 89.6859423987.

The spelling of 721395 in words is "seven hundred twenty-one thousand, three hundred ninety-five".