1945643347 has 4 divisors (see below), whose sum is σ = 2030236560. Its totient is φ = 1861050136.

The previous prime is 1945643327. The next prime is 1945643383. The reversal of 1945643347 is 7433465491.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1945643347 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1945643297 and 1945643306.

It is not an unprimeable number, because it can be changed into a prime (1945643327) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 42296572 + ... + 42296617.

It is an arithmetic number, because the mean of its divisors is an integer number (507559140).

Almost surely, 2^1945643347 is an apocalyptic number.

1945643347 is a deficient number, since it is larger than the sum of its proper divisors (84593213).

1945643347 is an equidigital number, since it uses as much as digits as its factorization.

1945643347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84593212.

The product of its digits is 1088640, while the sum is 46.

The square root of 1945643347 is about 44109.4473667490. The cubic root of 1945643347 is about 1248.4018716861.

The spelling of 1945643347 in words is "one billion, nine hundred forty-five million, six hundred forty-three thousand, three hundred forty-seven".