6421087 has 4 divisors (see below), whose sum is σ = 6798816. Its totient is φ = 6043360.

The previous prime is 6421073. The next prime is 6421099. The reversal of 6421087 is 7801246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7801246 = 2 ⋅3900623.

It is a cyclic number.

It is not a de Polignac number, because 6421087 - 2⁷ = 6420959 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 (6421067) 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, 188839 + ... + 188872.

It is an arithmetic number, because the mean of its divisors is an integer number (1699704).

Almost surely, 2^6421087 is an apocalyptic number.

6421087 is a deficient number, since it is larger than the sum of its proper divisors (377729).

6421087 is a wasteful number, since it uses less digits than its factorization.

6421087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377728.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 6421087 is about 2533.9863851252. The cubic root of 6421087 is about 185.8672406016.

The spelling of 6421087 in words is "six million, four hundred twenty-one thousand, eighty-seven".