6422987 has 4 divisors (see below), whose sum is σ = 6461616. Its totient is φ = 6384360.

The previous prime is 6422981. The next prime is 6422989. The reversal of 6422987 is 7892246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7892246 = 2 ⋅3946123.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6422987 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6422987.

It is not an unprimeable number, because it can be changed into a prime (6422981) 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, 19064 + ... + 19397.

It is an arithmetic number, because the mean of its divisors is an integer number (1615404).

Almost surely, 2^6422987 is an apocalyptic number.

6422987 is a deficient number, since it is larger than the sum of its proper divisors (38629).

6422987 is a wasteful number, since it uses less digits than its factorization.

6422987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38628.

The product of its digits is 48384, while the sum is 38.

The square root of 6422987 is about 2534.3612607519. The cubic root of 6422987 is about 185.8855715026.

The spelling of 6422987 in words is "six million, four hundred twenty-two thousand, nine hundred eighty-seven".