720431 has 4 divisors (see below), whose sum is σ = 727272. Its totient is φ = 713592.

The previous prime is 720413. The next prime is 720439. The reversal of 720431 is 134027.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134027 = 101 ⋅1327.

It is a cyclic number.

It is not a de Polignac number, because 720431 - 2⁶ = 720367 is a prime.

It is a super-2 number, since 2×720431² = 1038041651522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3260 + ... + 3473.

It is an arithmetic number, because the mean of its divisors is an integer number (181818).

2⁷²⁰⁴³¹ is an apocalyptic number.

720431 is a deficient number, since it is larger than the sum of its proper divisors (6841).

720431 is a wasteful number, since it uses less digits than its factorization.

720431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6840.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 720431 is about 848.7820686136. The cubic root of 720431 is about 89.6459754883.

Adding to 720431 its reverse (134027), we get a palindrome (854458).

The spelling of 720431 in words is "seven hundred twenty thousand, four hundred thirty-one".