919443947 has 4 divisors (see below), whose sum is σ = 936792000. Its totient is φ = 902095896.

The previous prime is 919443893. The next prime is 919443961. The reversal of 919443947 is 749344919.

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 919443947 - 2²⁰ = 918395371 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 919443895 and 919443904.

It is not an unprimeable number, because it can be changed into a prime (919443977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8673947 + ... + 8674052.

It is an arithmetic number, because the mean of its divisors is an integer number (234198000).

Almost surely, 2^919443947 is an apocalyptic number.

919443947 is a deficient number, since it is larger than the sum of its proper divisors (17348053).

919443947 is a wasteful number, since it uses less digits than its factorization.

919443947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17348052.

The product of its digits is 979776, while the sum is 50.

The square root of 919443947 is about 30322.3341284935. The cubic root of 919443947 is about 972.3928407379.

The spelling of 919443947 in words is "nine hundred nineteen million, four hundred forty-three thousand, nine hundred forty-seven".