428384641 has 2 divisors, whose sum is σ = 428384642. Its totient is φ = 428384640.

The previous prime is 428384623. The next prime is 428384651. The reversal of 428384641 is 146483824.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 349690000 + 78694641 = 18700^2 + 8871^2 .

It is a cyclic number.

It is not a de Polignac number, because 428384641 - 2⁵ = 428384609 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 428384594 and 428384603.

It is not a weakly prime, because it can be changed into another prime (428384611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214192320 + 214192321.

It is an arithmetic number, because the mean of its divisors is an integer number (214192321).

Almost surely, 2^428384641 is an apocalyptic number.

It is an amenable number.

428384641 is a deficient number, since it is larger than the sum of its proper divisors (1).

428384641 is an equidigital number, since it uses as much as digits as its factorization.

428384641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 147456, while the sum is 40.

The square root of 428384641 is about 20697.4549401611. The cubic root of 428384641 is about 753.8378923146.

It can be divided in two parts, 428384 and 641, that added together give a square (429025 = 655²).

The spelling of 428384641 in words is "four hundred twenty-eight million, three hundred eighty-four thousand, six hundred forty-one".