19969723 has 2 divisors, whose sum is σ = 19969724. Its totient is φ = 19969722.

The previous prime is 19969687. The next prime is 19969769. The reversal of 19969723 is 32796991.

It is an a-pointer prime, because the next prime (19969769) can be obtained adding 19969723 to its sum of digits (46).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19969723 - 2⁹ = 19969211 is a prime.

It is not a weakly prime, because it can be changed into another prime (19969793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9984861 + 9984862.

It is an arithmetic number, because the mean of its divisors is an integer number (9984862).

Almost surely, 2^19969723 is an apocalyptic number.

19969723 is a deficient number, since it is larger than the sum of its proper divisors (1).

19969723 is an equidigital number, since it uses as much as digits as its factorization.

19969723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 183708, while the sum is 46.

The square root of 19969723 is about 4468.7496013986. The cubic root of 19969723 is about 271.3047184450.

The spelling of 19969723 in words is "nineteen million, nine hundred sixty-nine thousand, seven hundred twenty-three".