1945478906 has 8 divisors (see below), whose sum is σ = 3335106720. Its totient is φ = 833776668.

The previous prime is 1945478879. The next prime is 1945478911. The reversal of 1945478906 is 6098745491.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69481376 + ... + 69481403.

It is an arithmetic number, because the mean of its divisors is an integer number (416888340).

Almost surely, 2^1945478906 is an apocalyptic number.

1945478906 is a deficient number, since it is larger than the sum of its proper divisors (1389627814).

1945478906 is a wasteful number, since it uses less digits than its factorization.

1945478906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138962788.

The product of its (nonzero) digits is 2177280, while the sum is 53.

The square root of 1945478906 is about 44107.5833162507. The cubic root of 1945478906 is about 1248.3667000746.

The spelling of 1945478906 in words is "one billion, nine hundred forty-five million, four hundred seventy-eight thousand, nine hundred six".