720019 has 2 divisors, whose sum is σ = 720020. Its totient is φ = 720018.

The previous prime is 720007. The next prime is 720023. The reversal of 720019 is 910027.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 720019 - 2¹⁷ = 588947 is a prime.

It is a super-2 number, since 2×720019² = 1036854720722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 719978 and 720005.

It is not a weakly prime, because it can be changed into another prime (720059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360009 + 360010.

It is an arithmetic number, because the mean of its divisors is an integer number (360010).

2⁷²⁰⁰¹⁹ is an apocalyptic number.

720019 is a deficient number, since it is larger than the sum of its proper divisors (1).

720019 is an equidigital number, since it uses as much as digits as its factorization.

720019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126, while the sum is 19.

The square root of 720019 is about 848.5393332074. The cubic root of 720019 is about 89.6288833195.

It can be divided in two parts, 72001 and 9, that added together give a triangular number (72010 = T₃₇₉).

The spelling of 720019 in words is "seven hundred twenty thousand, nineteen".