6420586 has 4 divisors (see below), whose sum is σ = 9630882. Its totient is φ = 3210292.

The previous prime is 6420523. The next prime is 6420587. The reversal of 6420586 is 6850246.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 6155361 + 265225 = 2481^2 + 515^2 .

It is not an unprimeable number, because it can be changed into a prime (6420587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1605145 + ... + 1605148.

Almost surely, 2^6420586 is an apocalyptic number.

6420586 is a deficient number, since it is larger than the sum of its proper divisors (3210296).

6420586 is a wasteful number, since it uses less digits than its factorization.

6420586 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3210295.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 6420586 is about 2533.8875271014. The cubic root of 6420586 is about 185.8624064300.

The spelling of 6420586 in words is "six million, four hundred twenty thousand, five hundred eighty-six".