1272342345 has 8 divisors (see below), whose sum is σ = 2035747776. Its totient is φ = 678582576.

The previous prime is 1272342319. The next prime is 1272342361. The reversal of 1272342345 is 5432432721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1272342345 - 2²⁹ = 735471433 is a prime.

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, 42411397 + ... + 42411426.

It is an arithmetic number, because the mean of its divisors is an integer number (254468472).

Almost surely, 2^1272342345 is an apocalyptic number.

1272342345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1272342345 is a deficient number, since it is larger than the sum of its proper divisors (763405431).

1272342345 is an equidigital number, since it uses as much as digits as its factorization.

1272342345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84822831.

The product of its digits is 40320, while the sum is 33.

The square root of 1272342345 is about 35669.9081159456. The cubic root of 1272342345 is about 1083.5974983935.

The spelling of 1272342345 in words is "one billion, two hundred seventy-two million, three hundred forty-two thousand, three hundred forty-five".