428235749 has 2 divisors, whose sum is σ = 428235750. Its totient is φ = 428235748.

The previous prime is 428235733. The next prime is 428235751. The reversal of 428235749 is 947532824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 332332900 + 95902849 = 18230^2 + 9793^2 .

It is a cyclic number.

It is not a de Polignac number, because 428235749 - 2⁴ = 428235733 is a prime.

Together with 428235751, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428235149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214117874 + 214117875.

It is an arithmetic number, because the mean of its divisors is an integer number (214117875).

Almost surely, 2^428235749 is an apocalyptic number.

It is an amenable number.

428235749 is a deficient number, since it is larger than the sum of its proper divisors (1).

428235749 is an equidigital number, since it uses as much as digits as its factorization.

428235749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 44.

The square root of 428235749 is about 20693.8577602147. The cubic root of 428235749 is about 753.7505460165.

The spelling of 428235749 in words is "four hundred twenty-eight million, two hundred thirty-five thousand, seven hundred forty-nine".