19039997 has 2 divisors, whose sum is σ = 19039998. Its totient is φ = 19039996.

The previous prime is 19039981. The next prime is 19040009. The reversal of 19039997 is 79993091.

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., 15452761 + 3587236 = 3931^2 + 1894^2 .

It is a cyclic number.

It is not a de Polignac number, because 19039997 - 2⁴ = 19039981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19039597) 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, 9519998 + 9519999.

It is an arithmetic number, because the mean of its divisors is an integer number (9519999).

Almost surely, 2^19039997 is an apocalyptic number.

It is an amenable number.

19039997 is a deficient number, since it is larger than the sum of its proper divisors (1).

19039997 is an equidigital number, since it uses as much as digits as its factorization.

19039997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 137781, while the sum is 47.

The square root of 19039997 is about 4363.4845020923. The cubic root of 19039997 is about 267.0272758493.

The spelling of 19039997 in words is "nineteen million, thirty-nine thousand, nine hundred ninety-seven".