1994544815 has 4 divisors (see below), whose sum is σ = 2393453784. Its totient is φ = 1595635848.

The previous prime is 1994544793. The next prime is 1994544857. The reversal of 1994544815 is 5184454991.

It is a happy number.

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-1994544815 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 199454477 + ... + 199454486.

It is an arithmetic number, because the mean of its divisors is an integer number (598363446).

Almost surely, 2^1994544815 is an apocalyptic number.

1994544815 is a deficient number, since it is larger than the sum of its proper divisors (398908969).

1994544815 is an equidigital number, since it uses as much as digits as its factorization.

1994544815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398908968.

The product of its digits is 1036800, while the sum is 50.

The square root of 1994544815 is about 44660.3270812026. The cubic root of 1994544815 is about 1258.7744897438.

The spelling of 1994544815 in words is "one billion, nine hundred ninety-four million, five hundred forty-four thousand, eight hundred fifteen".