421087 has 4 divisors (see below), whose sum is σ = 422496. Its totient is φ = 419680.

The previous prime is 421081. The next prime is 421093. The reversal of 421087 is 780124.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (421081) and next prime (421093).

It is a cyclic number.

It is not a de Polignac number, because 421087 - 2³ = 421079 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58 + ... + 919.

It is an arithmetic number, because the mean of its divisors is an integer number (105624).

2⁴²¹⁰⁸⁷ is an apocalyptic number.

421087 is a deficient number, since it is larger than the sum of its proper divisors (1409).

421087 is an equidigital number, since it uses as much as digits as its factorization.

421087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1408.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 421087 is about 648.9121666297. The cubic root of 421087 is about 74.9532745996.

It can be divided in two parts, 42 and 1087, that multiplied together give a palindrome (45654).

The spelling of 421087 in words is "four hundred twenty-one thousand, eighty-seven".