1243255967 has 4 divisors (see below), whose sum is σ = 1247983440. Its totient is φ = 1238528496.

The previous prime is 1243255963. The next prime is 1243255973. The reversal of 1243255967 is 7695523421.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1243255967 - 2² = 1243255963 is a prime.

It is a super-2 number, since 2×1243255967² = 3091370798962210178, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243255963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2363342 + ... + 2363867.

It is an arithmetic number, because the mean of its divisors is an integer number (311995860).

Almost surely, 2^1243255967 is an apocalyptic number.

1243255967 is a deficient number, since it is larger than the sum of its proper divisors (4727473).

1243255967 is an equidigital number, since it uses as much as digits as its factorization.

1243255967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4727472.

The product of its digits is 453600, while the sum is 44.

The square root of 1243255967 is about 35259.8350393192. The cubic root of 1243255967 is about 1075.2765733664.

The spelling of 1243255967 in words is "one billion, two hundred forty-three million, two hundred fifty-five thousand, nine hundred sixty-seven".