659421 has 20 divisors (see below), whose sum is σ = 1126752. Its totient is φ = 376488.

The previous prime is 659419. The next prime is 659423. The reversal of 659421 is 124956.

659421 is a `hidden beast` number, since 659 + 4 + 2 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (659419) and next prime (659423).

It is not a de Polignac number, because 659421 - 2¹ = 659419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

659421 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (659423) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 15 + ... + 1148.

2⁶⁵⁹⁴²¹ is an apocalyptic number.

It is an amenable number.

659421 is a deficient number, since it is larger than the sum of its proper divisors (467331).

659421 is a wasteful number, since it uses less digits than its factorization.

659421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1182 (or 1173 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 659421 is about 812.0474124089. The cubic root of 659421 is about 87.0404092898.

The spelling of 659421 in words is "six hundred fifty-nine thousand, four hundred twenty-one".