428749 has 4 divisors (see below), whose sum is σ = 432864. Its totient is φ = 424636.

The previous prime is 428741. The next prime is 428759. The reversal of 428749 is 947824.

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 428749 - 2³ = 428741 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1897 + ... + 2110.

It is an arithmetic number, because the mean of its divisors is an integer number (108216).

2⁴²⁸⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

428749 is a deficient number, since it is larger than the sum of its proper divisors (4115).

428749 is a wasteful number, since it uses less digits than its factorization.

428749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4114.

The product of its digits is 16128, while the sum is 34.

The square root of 428749 is about 654.7892790814. The cubic root of 428749 is about 75.4051555270.

The spelling of 428749 in words is "four hundred twenty-eight thousand, seven hundred forty-nine".