19640003 has 2 divisors, whose sum is σ = 19640004. Its totient is φ = 19640002.

The previous prime is 19639967. The next prime is 19640011. The reversal of 19640003 is 30004691.

It is a strong prime.

It is an emirp because it is prime and its reverse (30004691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19640003 - 2⁸ = 19639747 is a prime.

It is not a weakly prime, because it can be changed into another prime (19640063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9820001 + 9820002.

It is an arithmetic number, because the mean of its divisors is an integer number (9820002).

Almost surely, 2^19640003 is an apocalyptic number.

19640003 is a deficient number, since it is larger than the sum of its proper divisors (1).

19640003 is an equidigital number, since it uses as much as digits as its factorization.

19640003 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 19640003 is about 4431.7042997023. The cubic root of 19640003 is about 269.8032540162.

Adding to 19640003 its reverse (30004691), we get a palindrome (49644694).

The spelling of 19640003 in words is "nineteen million, six hundred forty thousand, three".