420931 has 4 divisors (see below), whose sum is σ = 481072. Its totient is φ = 360792.

The previous prime is 420929. The next prime is 420941. The reversal of 420931 is 139024.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 420931 - 2¹ = 420929 is a prime.

It is a super-2 number, since 2×420931² = 354365813522, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 420899 and 420908.

It is not an unprimeable number, because it can be changed into a prime (420941) 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, 30060 + ... + 30073.

It is an arithmetic number, because the mean of its divisors is an integer number (120268).

2⁴²⁰⁹³¹ is an apocalyptic number.

420931 is a deficient number, since it is larger than the sum of its proper divisors (60141).

420931 is an equidigital number, since it uses as much as digits as its factorization.

420931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60140.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 420931 is about 648.7919543274. The cubic root of 420931 is about 74.9440174824.

Adding to 420931 its reverse (139024), we get a palindrome (559955).

The spelling of 420931 in words is "four hundred twenty thousand, nine hundred thirty-one".