1994478447 has 16 divisors (see below), whose sum is σ = 2868914048. Its totient is φ = 1225208160.

The previous prime is 1994478433. The next prime is 1994478449. The reversal of 1994478447 is 7448744991.

It is not a de Polignac number, because 1994478447 - 2⁶ = 1994478383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1994478449) 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 15 ways as a sum of consecutive naturals, for example, 22513 + ... + 67050.

It is an arithmetic number, because the mean of its divisors is an integer number (179307128).

Almost surely, 2^1994478447 is an apocalyptic number.

1994478447 is a deficient number, since it is larger than the sum of its proper divisors (874435601).

1994478447 is a wasteful number, since it uses less digits than its factorization.

1994478447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90150.

The product of its digits is 8128512, while the sum is 57.

The square root of 1994478447 is about 44659.5840441892. The cubic root of 1994478447 is about 1258.7605277826.

The spelling of 1994478447 in words is "one billion, nine hundred ninety-four million, four hundred seventy-eight thousand, four hundred forty-seven".