720381 has 8 divisors (see below), whose sum is σ = 969760. Its totient is φ = 475632.

The previous prime is 720373. The next prime is 720397. The reversal of 720381 is 183027.

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

It is not a de Polignac number, because 720381 - 2³ = 720373 is a prime.

It is a super-2 number, since 2×720381² = 1037897570322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 775 + ... + 1428.

It is an arithmetic number, because the mean of its divisors is an integer number (121220).

2⁷²⁰³⁸¹ is an apocalyptic number.

It is an amenable number.

720381 is a deficient number, since it is larger than the sum of its proper divisors (249379).

720381 is a wasteful number, since it uses less digits than its factorization.

720381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2315.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 720381 is about 848.7526141344. The cubic root of 720381 is about 89.6439015434.

The spelling of 720381 in words is "seven hundred twenty thousand, three hundred eighty-one".