720387 has 8 divisors (see below), whose sum is σ = 1067280. Its totient is φ = 480240.

The previous prime is 720373. The next prime is 720397. The reversal of 720387 is 783027.

It is not a de Polignac number, because 720387 - 2¹² = 716291 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 26681 = 720387 / (7 + 2 + 0 + 3 + 8 + 7).

It is a self number, because there is not a number n which added to its sum of digits gives 720387.

It is not an unprimeable number, because it can be changed into a prime (720367) 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 7 ways as a sum of consecutive naturals, for example, 13314 + ... + 13367.

It is an arithmetic number, because the mean of its divisors is an integer number (133410).

2⁷²⁰³⁸⁷ is an apocalyptic number.

720387 is a deficient number, since it is larger than the sum of its proper divisors (346893).

720387 is a wasteful number, since it uses less digits than its factorization.

720387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26690 (or 26684 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 720387 is about 848.7561487259. The cubic root of 720387 is about 89.6441504219.

The spelling of 720387 in words is "seven hundred twenty thousand, three hundred eighty-seven".