428809397 has 2 divisors, whose sum is σ = 428809398. Its totient is φ = 428809396.

The previous prime is 428809361. The next prime is 428809417. The reversal of 428809397 is 793908824.

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., 215678596 + 213130801 = 14686^2 + 14599^2 .

It is a cyclic number.

It is not a de Polignac number, because 428809397 - 2⁶ = 428809333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428809327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214404698 + 214404699.

It is an arithmetic number, because the mean of its divisors is an integer number (214404699).

Almost surely, 2^428809397 is an apocalyptic number.

It is an amenable number.

428809397 is a deficient number, since it is larger than the sum of its proper divisors (1).

428809397 is an equidigital number, since it uses as much as digits as its factorization.

428809397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 50.

The square root of 428809397 is about 20707.7134662425. The cubic root of 428809397 is about 754.0869608441.

The spelling of 428809397 in words is "four hundred twenty-eight million, eight hundred nine thousand, three hundred ninety-seven".