672421 has 8 divisors (see below), whose sum is σ = 704000. Its totient is φ = 641520.

The previous prime is 672379. The next prime is 672439. The reversal of 672421 is 124276.

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 672421 - 2⁷ = 672293 is a prime.

It is a Duffinian number.

672421 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 672392 and 672401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (672521) 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, 3280 + ... + 3478.

It is an arithmetic number, because the mean of its divisors is an integer number (88000).

2⁶⁷²⁴²¹ is an apocalyptic number.

It is an amenable number.

672421 is a deficient number, since it is larger than the sum of its proper divisors (31579).

672421 is a wasteful number, since it uses less digits than its factorization.

672421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339.

The product of its digits is 672, while the sum is 22.

The square root of 672421 is about 820.0128047781. The cubic root of 672421 is about 87.6086704233.

Adding to 672421 its reverse (124276), we get a palindrome (796697).

It can be divided in two parts, 6 and 72421, that added together give a palindrome (72427).

The spelling of 672421 in words is "six hundred seventy-two thousand, four hundred twenty-one".