420340331 has 4 divisors (see below), whose sum is σ = 420600312. Its totient is φ = 420080352.

The previous prime is 420340307. The next prime is 420340373. The reversal of 420340331 is 133043024.

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 420340331 - 2⁶ = 420340267 is a prime.

It is a super-2 number, since 2×420340331² = 353371987730379122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420340931) 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, 127550 + ... + 130803.

It is an arithmetic number, because the mean of its divisors is an integer number (105150078).

Almost surely, 2^420340331 is an apocalyptic number.

420340331 is a deficient number, since it is larger than the sum of its proper divisors (259981).

420340331 is a wasteful number, since it uses less digits than its factorization.

420340331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259980.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 420340331 is about 20502.2030767428. The cubic root of 420340331 is about 749.0894615255.

Adding to 420340331 its reverse (133043024), we get a palindrome (553383355).

The spelling of 420340331 in words is "four hundred twenty million, three hundred forty thousand, three hundred thirty-one".