8420487 has 4 divisors (see below), whose sum is σ = 11227320. Its totient is φ = 5613656.

The previous prime is 8420483. The next prime is 8420509. The reversal of 8420487 is 7840248.

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 8420487 - 2² = 8420483 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8420483) 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, 1403412 + ... + 1403417.

It is an arithmetic number, because the mean of its divisors is an integer number (2806830).

Almost surely, 2^8420487 is an apocalyptic number.

8420487 is a deficient number, since it is larger than the sum of its proper divisors (2806833).

8420487 is a wasteful number, since it uses less digits than its factorization.

8420487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2806832.

The product of its (nonzero) digits is 14336, while the sum is 33.

The square root of 8420487 is about 2901.8075401377. The cubic root of 8420487 is about 203.4443983989. Note that the first 3 decimals are identical.

The spelling of 8420487 in words is "eight million, four hundred twenty thousand, four hundred eighty-seven".