19303997 has 2 divisors, whose sum is σ = 19303998. Its totient is φ = 19303996.

The previous prime is 19303967. The next prime is 19304003. The reversal of 19303997 is 79930391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17131321 + 2172676 = 4139^2 + 1474^2 .

It is a cyclic number.

It is not a de Polignac number, because 19303997 - 2⁸ = 19303741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19303967) 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, 9651998 + 9651999.

It is an arithmetic number, because the mean of its divisors is an integer number (9651999).

Almost surely, 2^19303997 is an apocalyptic number.

It is an amenable number.

19303997 is a deficient number, since it is larger than the sum of its proper divisors (1).

19303997 is an equidigital number, since it uses as much as digits as its factorization.

19303997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45927, while the sum is 41.

The square root of 19303997 is about 4393.6314137624. The cubic root of 19303997 is about 268.2557751580.

The spelling of 19303997 in words is "nineteen million, three hundred three thousand, nine hundred ninety-seven".