427981 has 4 divisors (see below), whose sum is σ = 431200. Its totient is φ = 424764.

The previous prime is 427969. The next prime is 427991. The reversal of 427981 is 189724.

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.

It is a cyclic number.

It is not a de Polignac number, because 427981 - 2⁵ = 427949 is a prime.

It is a super-2 number, since 2×427981² = 366335472722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (427951) 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, 1401 + ... + 1678.

It is an arithmetic number, because the mean of its divisors is an integer number (107800).

2⁴²⁷⁹⁸¹ is an apocalyptic number.

It is an amenable number.

427981 is a deficient number, since it is larger than the sum of its proper divisors (3219).

427981 is a wasteful number, since it uses less digits than its factorization.

427981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3218.

The product of its digits is 4032, while the sum is 31.

The square root of 427981 is about 654.2025680170. The cubic root of 427981 is about 75.3601052592.

The spelling of 427981 in words is "four hundred twenty-seven thousand, nine hundred eighty-one".