15643423 has 2 divisors, whose sum is σ = 15643424. Its totient is φ = 15643422.

The previous prime is 15643421. The next prime is 15643447. The reversal of 15643423 is 32434651.

It is a weak prime.

It is an emirp because it is prime and its reverse (32434651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15643423 - 2¹ = 15643421 is a prime.

Together with 15643421, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 15643391 and 15643400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15643421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7821711 + 7821712.

It is an arithmetic number, because the mean of its divisors is an integer number (7821712).

Almost surely, 2^15643423 is an apocalyptic number.

15643423 is a deficient number, since it is larger than the sum of its proper divisors (1).

15643423 is an equidigital number, since it uses as much as digits as its factorization.

15643423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 28.

The square root of 15643423 is about 3955.1767343571. The cubic root of 15643423 is about 250.0982174083.

The spelling of 15643423 in words is "fifteen million, six hundred forty-three thousand, four hundred twenty-three".