8420931 has 12 divisors (see below), whose sum is σ = 12311208. Its totient is φ = 5545824.

The previous prime is 8420927. The next prime is 8420939. The reversal of 8420931 is 1390248.

It is not a de Polignac number, because 8420931 - 2² = 8420927 is a prime.

It is a super-2 number, since 2×8420931² = 141824157813522, which contains 22 as substring.

8420931 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 8420895 and 8420904.

It is not an unprimeable number, because it can be changed into a prime (8420939) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4890 + ... + 6383.

It is an arithmetic number, because the mean of its divisors is an integer number (1025934).

Almost surely, 2^8420931 is an apocalyptic number.

8420931 is a deficient number, since it is larger than the sum of its proper divisors (3890277).

8420931 is a wasteful number, since it uses less digits than its factorization.

8420931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11362 (or 11359 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 8420931 is about 2901.8840431692. The cubic root of 8420931 is about 203.4479741116.

The spelling of 8420931 in words is "eight million, four hundred twenty thousand, nine hundred thirty-one".