658421 has 4 divisors (see below), whose sum is σ = 687072. Its totient is φ = 629772.

The previous prime is 658417. The next prime is 658433. The reversal of 658421 is 124856.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 658421 - 2² = 658417 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (658321) 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, 14291 + ... + 14336.

It is an arithmetic number, because the mean of its divisors is an integer number (171768).

2⁶⁵⁸⁴²¹ is an apocalyptic number.

It is an amenable number.

658421 is a deficient number, since it is larger than the sum of its proper divisors (28651).

658421 is a wasteful number, since it uses less digits than its factorization.

658421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28650.

The product of its digits is 1920, while the sum is 26.

The square root of 658421 is about 811.4314512021. The cubic root of 658421 is about 86.9963886289.

The spelling of 658421 in words is "six hundred fifty-eight thousand, four hundred twenty-one".