421769 has 4 divisors (see below), whose sum is σ = 423120. Its totient is φ = 420420.

The previous prime is 421741. The next prime is 421783. The reversal of 421769 is 967124.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421769 is a prime.

It is a super-2 number, since 2×421769² = 355778178722, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (421709) 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, 62 + ... + 920.

It is an arithmetic number, because the mean of its divisors is an integer number (105780).

2⁴²¹⁷⁶⁹ is an apocalyptic number.

It is an amenable number.

421769 is a deficient number, since it is larger than the sum of its proper divisors (1351).

421769 is an equidigital number, since it uses as much as digits as its factorization.

421769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1350.

The product of its digits is 3024, while the sum is 29.

The square root of 421769 is about 649.4374488740. The cubic root of 421769 is about 74.9937179924.

The spelling of 421769 in words is "four hundred twenty-one thousand, seven hundred sixty-nine".