1323991966 has 16 divisors (see below), whose sum is σ = 2177764848. Its totient is φ = 598694400.

The previous prime is 1323991957. The next prime is 1323991997. The reversal of 1323991966 is 6691993231.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151665 + ... + 160156.

It is an arithmetic number, because the mean of its divisors is an integer number (136110303).

Almost surely, 2^1323991966 is an apocalyptic number.

1323991966 is a deficient number, since it is larger than the sum of its proper divisors (853772882).

1323991966 is a wasteful number, since it uses less digits than its factorization.

1323991966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312027.

The product of its digits is 472392, while the sum is 49.

The square root of 1323991966 is about 36386.7004000088. The cubic root of 1323991966 is about 1098.0660138390.

The spelling of 1323991966 in words is "one billion, three hundred twenty-three million, nine hundred ninety-one thousand, nine hundred sixty-six".