1947889005 has 8 divisors (see below), whose sum is σ = 3116622432. Its totient is φ = 1038874128.

The previous prime is 1947888997. The next prime is 1947889033. The reversal of 1947889005 is 5009887491.

1947889005 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 1947889005 - 2³ = 1947888997 is a prime.

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, 64929619 + ... + 64929648.

It is an arithmetic number, because the mean of its divisors is an integer number (389577804).

Almost surely, 2^1947889005 is an apocalyptic number.

1947889005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1947889005 is a deficient number, since it is larger than the sum of its proper divisors (1168733427).

1947889005 is a wasteful number, since it uses less digits than its factorization.

1947889005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129859275.

The product of its (nonzero) digits is 725760, while the sum is 51.

The square root of 1947889005 is about 44134.8955476276. The cubic root of 1947889005 is about 1248.8819880709.

The spelling of 1947889005 in words is "one billion, nine hundred forty-seven million, eight hundred eighty-nine thousand, five".