919994047 has 4 divisors (see below), whose sum is σ = 1051421776. Its totient is φ = 788566320.

The previous prime is 919993993. The next prime is 919994051. The reversal of 919994047 is 740499919.

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-919994047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 919993985 and 919994003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (919994077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65713854 + ... + 65713867.

It is an arithmetic number, because the mean of its divisors is an integer number (262855444).

Almost surely, 2^919994047 is an apocalyptic number.

919994047 is a deficient number, since it is larger than the sum of its proper divisors (131427729).

919994047 is a wasteful number, since it uses less digits than its factorization.

919994047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131427728.

The product of its (nonzero) digits is 734832, while the sum is 52.

The square root of 919994047 is about 30331.4036437485. The cubic root of 919994047 is about 972.5867284530.

The spelling of 919994047 in words is "nine hundred nineteen million, nine hundred ninety-four thousand, forty-seven".