1281223966 has 16 divisors (see below), whose sum is σ = 2097672048. Its totient is φ = 582062400.

The previous prime is 1281223963. The next prime is 1281223981. The reversal of 1281223966 is 6693221821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281223963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29236 + ... + 58456.

It is an arithmetic number, because the mean of its divisors is an integer number (131104503).

Almost surely, 2^1281223966 is an apocalyptic number.

1281223966 is a deficient number, since it is larger than the sum of its proper divisors (816448082).

1281223966 is a wasteful number, since it uses less digits than its factorization.

1281223966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31227.

The product of its digits is 62208, while the sum is 40.

The square root of 1281223966 is about 35794.1889976571. The cubic root of 1281223966 is about 1086.1130150196.

The spelling of 1281223966 in words is "one billion, two hundred eighty-one million, two hundred twenty-three thousand, nine hundred sixty-six".