421469 has 2 divisors, whose sum is σ = 421470. Its totient is φ = 421468.

The previous prime is 421459. The next prime is 421471. The reversal of 421469 is 964124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 315844 + 105625 = 562^2 + 325^2 .

It is a cyclic number.

It is not a de Polignac number, because 421469 - 2⁴ = 421453 is a prime.

It is a super-2 number, since 2×421469² = 355272235922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 421471, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210734 + 210735.

It is an arithmetic number, because the mean of its divisors is an integer number (210735).

2⁴²¹⁴⁶⁹ is an apocalyptic number.

It is an amenable number.

421469 is a deficient number, since it is larger than the sum of its proper divisors (1).

421469 is an equidigital number, since it uses as much as digits as its factorization.

421469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 26.

The square root of 421469 is about 649.2064386618. The cubic root of 421469 is about 74.9759330186.

The spelling of 421469 in words is "four hundred twenty-one thousand, four hundred sixty-nine".