19460813 has 2 divisors, whose sum is σ = 19460814. Its totient is φ = 19460812.

The previous prime is 19460809. The next prime is 19460843. The reversal of 19460813 is 31806491.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11854249 + 7606564 = 3443^2 + 2758^2 .

It is an emirp because it is prime and its reverse (31806491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19460813 - 2² = 19460809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19460813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19460843) 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, 9730406 + 9730407.

It is an arithmetic number, because the mean of its divisors is an integer number (9730407).

Almost surely, 2^19460813 is an apocalyptic number.

It is an amenable number.

19460813 is a deficient number, since it is larger than the sum of its proper divisors (1).

19460813 is an equidigital number, since it uses as much as digits as its factorization.

19460813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 19460813 is about 4411.4411477430. The cubic root of 19460813 is about 268.9802088782.

The spelling of 19460813 in words is "nineteen million, four hundred sixty thousand, eight hundred thirteen".