981421 has 6 divisors (see below), whose sum is σ = 1141710. Its totient is φ = 841176.

The previous prime is 981419. The next prime is 981437. The reversal of 981421 is 124189.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 741321 + 240100 = 861^2 + 490^2 .

It is not a de Polignac number, because 981421 - 2¹ = 981419 is a prime.

It is a Duffinian number.

981421 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981451) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9966 + ... + 10063.

It is an arithmetic number, because the mean of its divisors is an integer number (190285).

2⁹⁸¹⁴²¹ is an apocalyptic number.

It is an amenable number.

981421 is a deficient number, since it is larger than the sum of its proper divisors (160289).

981421 is a wasteful number, since it uses less digits than its factorization.

981421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20043 (or 20036 counting only the distinct ones).

The product of its digits is 576, while the sum is 25.

The square root of 981421 is about 990.6669470614. Note that the first 3 decimals coincide. The cubic root of 981421 is about 99.3768245911.

The spelling of 981421 in words is "nine hundred eighty-one thousand, four hundred twenty-one".