428935921 has 4 divisors (see below), whose sum is σ = 434977344. Its totient is φ = 422894500.

The previous prime is 428935919. The next prime is 428935939. The reversal of 428935921 is 129539824.

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 428935921 - 2¹ = 428935919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428935961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3020605 + ... + 3020746.

It is an arithmetic number, because the mean of its divisors is an integer number (108744336).

Almost surely, 2^428935921 is an apocalyptic number.

It is an amenable number.

428935921 is a deficient number, since it is larger than the sum of its proper divisors (6041423).

428935921 is an equidigital number, since it uses as much as digits as its factorization.

428935921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6041422.

The product of its digits is 155520, while the sum is 43.

The square root of 428935921 is about 20710.7682378033. The cubic root of 428935921 is about 754.1611202235.

It can be divided in two parts, 42893 and 5921, that multiplied together give a triangular number (253969453 = T₂₂₅₃₇).

The spelling of 428935921 in words is "four hundred twenty-eight million, nine hundred thirty-five thousand, nine hundred twenty-one".