720418 has 8 divisors (see below), whose sum is σ = 1117980. Its totient is φ = 347760.

The previous prime is 720413. The next prime is 720439. The reversal of 720418 is 814027.

It can be written as a sum of positive squares in 2 ways, for example, as 651249 + 69169 = 807^2 + 263^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (720413) 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, 6153 + ... + 6268.

2⁷²⁰⁴¹⁸ is an apocalyptic number.

720418 is a deficient number, since it is larger than the sum of its proper divisors (397562).

720418 is a wasteful number, since it uses less digits than its factorization.

720418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12452.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 720418 is about 848.7744105473. The cubic root of 720418 is about 89.6454362719.

The spelling of 720418 in words is "seven hundred twenty thousand, four hundred eighteen".