8420287 has 16 divisors (see below), whose sum is σ = 9504000. Its totient is φ = 7413120.

The previous prime is 8420281. The next prime is 8420311. The reversal of 8420287 is 7820248.

It is a cyclic number.

It is not a de Polignac number, because 8420287 - 2¹⁹ = 7895999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8420281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42214 + ... + 42412.

It is an arithmetic number, because the mean of its divisors is an integer number (594000).

Almost surely, 2^8420287 is an apocalyptic number.

8420287 is a deficient number, since it is larger than the sum of its proper divisors (1083713).

8420287 is a wasteful number, since it uses less digits than its factorization.

8420287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366.

The product of its (nonzero) digits is 7168, while the sum is 31.

The square root of 8420287 is about 2901.7730786538. The cubic root of 8420287 is about 203.4427876765.

The spelling of 8420287 in words is "eight million, four hundred twenty thousand, two hundred eighty-seven".