8421887 has 4 divisors (see below), whose sum is σ = 8788080. Its totient is φ = 8055696.

The previous prime is 8421877. The next prime is 8421901. The reversal of 8421887 is 7881248.

It is a happy number.

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 8421887 - 2⁶ = 8421823 is a prime.

It is a super-3 number, since 3×8421887³ (a number of 22 digits) contains 333 as substring.

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 8421887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8421827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183062 + ... + 183107.

It is an arithmetic number, because the mean of its divisors is an integer number (2197020).

Almost surely, 2^8421887 is an apocalyptic number.

8421887 is a deficient number, since it is larger than the sum of its proper divisors (366193).

8421887 is a wasteful number, since it uses less digits than its factorization.

8421887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366192.

The product of its digits is 28672, while the sum is 38.

The square root of 8421887 is about 2902.0487590666. The cubic root of 8421887 is about 203.4556727419.

The spelling of 8421887 in words is "eight million, four hundred twenty-one thousand, eight hundred eighty-seven".