428125987 has 2 divisors, whose sum is σ = 428125988. Its totient is φ = 428125986.

The previous prime is 428125981. The next prime is 428126003. The reversal of 428125987 is 789521824.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 428125987 - 2¹¹ = 428123939 is a prime.

It is not a weakly prime, because it can be changed into another prime (428125981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214062993 + 214062994.

It is an arithmetic number, because the mean of its divisors is an integer number (214062994).

Almost surely, 2^428125987 is an apocalyptic number.

428125987 is a deficient number, since it is larger than the sum of its proper divisors (1).

428125987 is an equidigital number, since it uses as much as digits as its factorization.

428125987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 322560, while the sum is 46.

The square root of 428125987 is about 20691.2055472851. The cubic root of 428125987 is about 753.6861420544.

The spelling of 428125987 in words is "four hundred twenty-eight million, one hundred twenty-five thousand, nine hundred eighty-seven".