8420331 has 8 divisors (see below), whose sum is σ = 11381200. Its totient is φ = 5536512.

The previous prime is 8420327. The next prime is 8420351. The reversal of 8420331 is 1330248.

It is a happy number.

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

It is not a de Polignac number, because 8420331 - 2² = 8420327 is a prime.

It is a super-2 number, since 2×8420331² = 141803948299122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8420298 and 8420307.

It is not an unprimeable number, because it can be changed into a prime (8420311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19006 + ... + 19443.

It is an arithmetic number, because the mean of its divisors is an integer number (1422650).

Almost surely, 2^8420331 is an apocalyptic number.

8420331 is a deficient number, since it is larger than the sum of its proper divisors (2960869).

8420331 is a wasteful number, since it uses less digits than its factorization.

8420331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38525.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 8420331 is about 2901.7806602154. The cubic root of 8420331 is about 203.4431420376.

Adding to 8420331 its reverse (1330248), we get a palindrome (9750579).

The spelling of 8420331 in words is "eight million, four hundred twenty thousand, three hundred thirty-one".