1994478449 has 2 divisors, whose sum is σ = 1994478450. Its totient is φ = 1994478448.

The previous prime is 1994478433. The next prime is 1994478467. The reversal of 1994478449 is 9448744991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1968519424 + 25959025 = 44368^2 + 5095^2 .

It is a cyclic number.

It is not a de Polignac number, because 1994478449 - 2⁴ = 1994478433 is a prime.

It is not a weakly prime, because it can be changed into another prime (1994478149) by changing a digit.

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 as a sum of consecutive naturals, namely, 997239224 + 997239225.

It is an arithmetic number, because the mean of its divisors is an integer number (997239225).

Almost surely, 2^1994478449 is an apocalyptic number.

It is an amenable number.

1994478449 is a deficient number, since it is larger than the sum of its proper divisors (1).

1994478449 is an equidigital number, since it uses as much as digits as its factorization.

1994478449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10450944, while the sum is 59.

The square root of 1994478449 is about 44659.5840665808. The cubic root of 1994478449 is about 1258.7605282033.

The spelling of 1994478449 in words is "one billion, nine hundred ninety-four million, four hundred seventy-eight thousand, four hundred forty-nine".