1323664726 has 4 divisors (see below), whose sum is σ = 1985497092. Its totient is φ = 661832362.

The previous prime is 1323664723. The next prime is 1323664747. The reversal of 1323664726 is 6274663231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6274663231 = 47 ⋅133503473.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1323664723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330916180 + ... + 330916183.

It is an arithmetic number, because the mean of its divisors is an integer number (496374273).

Almost surely, 2^1323664726 is an apocalyptic number.

1323664726 is a deficient number, since it is larger than the sum of its proper divisors (661832366).

1323664726 is an equidigital number, since it uses as much as digits as its factorization.

1323664726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661832365.

The product of its digits is 217728, while the sum is 40.

The square root of 1323664726 is about 36382.2034242018. The cubic root of 1323664726 is about 1097.9755397928.

The spelling of 1323664726 in words is "one billion, three hundred twenty-three million, six hundred sixty-four thousand, seven hundred twenty-six".