428308973 has 2 divisors, whose sum is σ = 428308974. Its totient is φ = 428308972.

The previous prime is 428308949. The next prime is 428308997. The reversal of 428308973 is 379803824.

It is a balanced prime because it is at equal distance from previous prime (428308949) and next prime (428308997).

It can be written as a sum of positive squares in only one way, i.e., 231131209 + 197177764 = 15203^2 + 14042^2 .

It is a cyclic number.

It is not a de Polignac number, because 428308973 - 2¹⁰ = 428307949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428368973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214154486 + 214154487.

It is an arithmetic number, because the mean of its divisors is an integer number (214154487).

Almost surely, 2^428308973 is an apocalyptic number.

It is an amenable number.

428308973 is a deficient number, since it is larger than the sum of its proper divisors (1).

428308973 is an equidigital number, since it uses as much as digits as its factorization.

428308973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 428308973 is about 20695.6269052184. The cubic root of 428308973 is about 753.7935048187.

The spelling of 428308973 in words is "four hundred twenty-eight million, three hundred eight thousand, nine hundred seventy-three".