721379 has 2 divisors, whose sum is σ = 721380. Its totient is φ = 721378.

The previous prime is 721363. The next prime is 721381. The reversal of 721379 is 973127.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 721379 - 2⁴ = 721363 is a prime.

Together with 721381, it forms a pair of twin primes.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 721379.

It is not a weakly prime, because it can be changed into another prime (721319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360689 + 360690.

It is an arithmetic number, because the mean of its divisors is an integer number (360690).

2⁷²¹³⁷⁹ is an apocalyptic number.

721379 is a deficient number, since it is larger than the sum of its proper divisors (1).

721379 is an equidigital number, since it uses as much as digits as its factorization.

721379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2646, while the sum is 29.

The square root of 721379 is about 849.3403322579. The cubic root of 721379 is about 89.6852793382.

The spelling of 721379 in words is "seven hundred twenty-one thousand, three hundred seventy-nine".