421309 has 8 divisors (see below), whose sum is σ = 486080. Its totient is φ = 357696.

The previous prime is 421303. The next prime is 421313. The reversal of 421309 is 903124.

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 421309 - 2⁷ = 421181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 757 + ... + 1189.

It is an arithmetic number, because the mean of its divisors is an integer number (60760).

2⁴²¹³⁰⁹ is an apocalyptic number.

It is an amenable number.

421309 is a deficient number, since it is larger than the sum of its proper divisors (64771).

421309 is a wasteful number, since it uses less digits than its factorization.

421309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 421309 is about 649.0831995977. The cubic root of 421309 is about 74.9664442483.

The spelling of 421309 in words is "four hundred twenty-one thousand, three hundred nine".