719921 has 4 divisors (see below), whose sum is σ = 728100. Its totient is φ = 711744.

The previous prime is 719911. The next prime is 719941. The reversal of 719921 is 129917.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55696 + 664225 = 236^2 + 815^2 .

It is a cyclic number.

It is not a de Polignac number, because 719921 - 2¹⁰ = 718897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (719911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3956 + ... + 4133.

It is an arithmetic number, because the mean of its divisors is an integer number (182025).

2⁷¹⁹⁹²¹ is an apocalyptic number.

It is an amenable number.

719921 is a deficient number, since it is larger than the sum of its proper divisors (8179).

719921 is an equidigital number, since it uses as much as digits as its factorization.

719921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8178.

The product of its digits is 1134, while the sum is 29.

The square root of 719921 is about 848.4815849504. The cubic root of 719921 is about 89.6248167467.

The spelling of 719921 in words is "seven hundred nineteen thousand, nine hundred twenty-one".