662421 has 4 divisors (see below), whose sum is σ = 883232. Its totient is φ = 441612.

The previous prime is 662407. The next prime is 662443. The reversal of 662421 is 124266.

It is a happy number.

662421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 662421 - 2⁶ = 662357 is a prime.

It is a super-3 number, since 3×662421³ = 872014146741733383, which contains 333 as substring.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (662401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110401 + ... + 110406.

It is an arithmetic number, because the mean of its divisors is an integer number (220808).

2⁶⁶²⁴²¹ is an apocalyptic number.

It is an amenable number.

662421 is a deficient number, since it is larger than the sum of its proper divisors (220811).

662421 is a wasteful number, since it uses less digits than its factorization.

662421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220810.

The product of its digits is 576, while the sum is 21.

The square root of 662421 is about 813.8924990439. The cubic root of 662421 is about 87.1722048297.

Adding to 662421 its reverse (124266), we get a palindrome (786687).

The spelling of 662421 in words is "six hundred sixty-two thousand, four hundred twenty-one".