19979503 has 2 divisors, whose sum is σ = 19979504. Its totient is φ = 19979502.

The previous prime is 19979497. The next prime is 19979527. The reversal of 19979503 is 30597991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19979503 - 2⁹ = 19978991 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19979503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19979803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9989751 + 9989752.

It is an arithmetic number, because the mean of its divisors is an integer number (9989752).

Almost surely, 2^19979503 is an apocalyptic number.

19979503 is a deficient number, since it is larger than the sum of its proper divisors (1).

19979503 is an equidigital number, since it uses as much as digits as its factorization.

19979503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 76545, while the sum is 43.

The square root of 19979503 is about 4469.8437332864. The cubic root of 19979503 is about 271.3490009338.

The spelling of 19979503 in words is "nineteen million, nine hundred seventy-nine thousand, five hundred three".