720427 has 4 divisors (see below), whose sum is σ = 739936. Its totient is φ = 700920.

The previous prime is 720413. The next prime is 720439. The reversal of 720427 is 724027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 724027 = 127 ⋅5701.

It is a cyclic number.

It is not a de Polignac number, because 720427 - 2⁷ = 720299 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 720398 and 720407.

It is not an unprimeable number, because it can be changed into a prime (720407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9699 + ... + 9772.

It is an arithmetic number, because the mean of its divisors is an integer number (184984).

2⁷²⁰⁴²⁷ is an apocalyptic number.

720427 is a deficient number, since it is larger than the sum of its proper divisors (19509).

720427 is a wasteful number, since it uses less digits than its factorization.

720427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19508.

The product of its (nonzero) digits is 784, while the sum is 22.

The square root of 720427 is about 848.7797122929. The cubic root of 720427 is about 89.6458095762.

Subtracting 720427 from its reverse (724027), we obtain a square (3600 = 60²).

The spelling of 720427 in words is "seven hundred twenty thousand, four hundred twenty-seven", and thus it is an iban number.