428981 has 4 divisors (see below), whose sum is σ = 490272. Its totient is φ = 367692.

The previous prime is 428977. The next prime is 429007. The reversal of 428981 is 189824.

It is a happy number.

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 428981 - 2² = 428977 is a prime.

It is a super-2 number, since 2×428981² = 368049396722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 428981.

It is not an unprimeable number, because it can be changed into a prime (428951) 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, 30635 + ... + 30648.

It is an arithmetic number, because the mean of its divisors is an integer number (122568).

2⁴²⁸⁹⁸¹ is an apocalyptic number.

It is an amenable number.

428981 is a deficient number, since it is larger than the sum of its proper divisors (61291).

428981 is an equidigital number, since it uses as much as digits as its factorization.

428981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61290.

The product of its digits is 4608, while the sum is 32.

The square root of 428981 is about 654.9664113525. The cubic root of 428981 is about 75.4187538807.

The spelling of 428981 in words is "four hundred twenty-eight thousand, nine hundred eighty-one".