19656223 has 2 divisors, whose sum is σ = 19656224. Its totient is φ = 19656222.

The previous prime is 19656193. The next prime is 19656239. The reversal of 19656223 is 32265691.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19656223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19656253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9828111 + 9828112.

It is an arithmetic number, because the mean of its divisors is an integer number (9828112).

Almost surely, 2^19656223 is an apocalyptic number.

19656223 is a deficient number, since it is larger than the sum of its proper divisors (1).

19656223 is an equidigital number, since it uses as much as digits as its factorization.

19656223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 34.

The square root of 19656223 is about 4433.5339177681. The cubic root of 19656223 is about 269.8775073078.

The spelling of 19656223 in words is "nineteen million, six hundred fifty-six thousand, two hundred twenty-three".