987421 has 8 divisors (see below), whose sum is σ = 1036800. Its totient is φ = 939120.

The previous prime is 987391. The next prime is 987433. The reversal of 987421 is 124789.

987421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 987421 - 2⁷ = 987293 is a prime.

It is a Duffinian number.

987421 is a lucky number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2076 + ... + 2506.

It is an arithmetic number, because the mean of its divisors is an integer number (129600).

2⁹⁸⁷⁴²¹ is an apocalyptic number.

It is an amenable number.

987421 is a deficient number, since it is larger than the sum of its proper divisors (49379).

987421 is a wasteful number, since it uses less digits than its factorization.

987421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539.

The product of its digits is 4032, while the sum is 31.

The square root of 987421 is about 993.6905957087. The cubic root of 987421 is about 99.5789294847.

Subtracting from 987421 its product of digits (4032), we obtain a palindrome (983389).

The spelling of 987421 in words is "nine hundred eighty-seven thousand, four hundred twenty-one".