421427 has 4 divisors (see below), whose sum is σ = 424776. Its totient is φ = 418080.

The previous prime is 421423. The next prime is 421433. The reversal of 421427 is 724124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 421427 - 2² = 421423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421399 and 421408.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 421427.

It is not an unprimeable number, because it can be changed into a prime (421423) 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, 1478 + ... + 1739.

It is an arithmetic number, because the mean of its divisors is an integer number (106194).

2⁴²¹⁴²⁷ is an apocalyptic number.

421427 is a deficient number, since it is larger than the sum of its proper divisors (3349).

421427 is a wasteful number, since it uses less digits than its factorization.

421427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3348.

The product of its digits is 448, while the sum is 20.

The square root of 421427 is about 649.1740906721. The cubic root of 421427 is about 74.9734424489.

Adding to 421427 its product of digits (448), we get a cube (421875 = 75³).

It can be divided in two parts, 421 and 427, that added together give a palindrome (848).

The spelling of 421427 in words is "four hundred twenty-one thousand, four hundred twenty-seven", and thus it is an iban number.