428939233 has 4 divisors (see below), whose sum is σ = 438914608. Its totient is φ = 418963860.

The previous prime is 428939221. The next prime is 428939237. The reversal of 428939233 is 332939824.

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 428939233 - 2⁹ = 428938721 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 9975331 = 428939233 / (4 + 2 + 8 + 9 + 3 + 9 + 2 + 3 + 3).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 428939233.

It is not an unprimeable number, because it can be changed into a prime (428939237) 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, 4987623 + ... + 4987708.

It is an arithmetic number, because the mean of its divisors is an integer number (109728652).

Almost surely, 2^428939233 is an apocalyptic number.

428939233 is a gapful number since it is divisible by the number (43) formed by its first and last digit.

It is an amenable number.

428939233 is a deficient number, since it is larger than the sum of its proper divisors (9975375).

428939233 is an equidigital number, since it uses as much as digits as its factorization.

428939233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9975374.

The product of its digits is 279936, while the sum is 43.

The square root of 428939233 is about 20710.8481960542. The cubic root of 428939233 is about 754.1630612867.

The spelling of 428939233 in words is "four hundred twenty-eight million, nine hundred thirty-nine thousand, two hundred thirty-three".