721995 has 16 divisors (see below), whose sum is σ = 1167360. Its totient is φ = 381024.

The previous prime is 721991. The next prime is 721997. The reversal of 721995 is 599127.

It is not a de Polignac number, because 721995 - 2² = 721991 is a prime.

721995 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (721991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1716 + ... + 2094.

It is an arithmetic number, because the mean of its divisors is an integer number (72960).

2⁷²¹⁹⁹⁵ is an apocalyptic number.

721995 is a deficient number, since it is larger than the sum of its proper divisors (445365).

721995 is a wasteful number, since it uses less digits than its factorization.

721995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514.

The product of its digits is 5670, while the sum is 33.

The square root of 721995 is about 849.7028892501. The cubic root of 721995 is about 89.7108000951.

The spelling of 721995 in words is "seven hundred twenty-one thousand, nine hundred ninety-five".