306400057 has 2 divisors, whose sum is σ = 306400058. Its totient is φ = 306400056.

The previous prime is 306400037. The next prime is 306400067. The reversal of 306400057 is 750004603.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 268009641 + 38390416 = 16371^2 + 6196^2 .

It is an emirp because it is prime and its reverse (750004603) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-306400057 is a prime.

It is not a weakly prime, because it can be changed into another prime (306400037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153200028 + 153200029.

It is an arithmetic number, because the mean of its divisors is an integer number (153200029).

Almost surely, 2^306400057 is an apocalyptic number.

It is an amenable number.

306400057 is a deficient number, since it is larger than the sum of its proper divisors (1).

306400057 is an equidigital number, since it uses as much as digits as its factorization.

306400057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 306400057 is about 17504.2868178055. The cubic root of 306400057 is about 674.1599477458.

The spelling of 306400057 in words is "three hundred six million, four hundred thousand, fifty-seven".