1994739905 has 8 divisors (see below), whose sum is σ = 2394014184. Its totient is φ = 1595574400.

The previous prime is 1994739881. The next prime is 1994739907. The reversal of 1994739905 is 5099374991.

It can be written as a sum of positive squares in 4 ways, for example, as 35438209 + 1959301696 = 5953^2 + 44264^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1994739905 - 2⁶ = 1994739841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1994739907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20885 + ... + 66525.

It is an arithmetic number, because the mean of its divisors is an integer number (299251773).

Almost surely, 2^1994739905 is an apocalyptic number.

It is an amenable number.

1994739905 is a deficient number, since it is larger than the sum of its proper divisors (399274279).

1994739905 is an equidigital number, since it uses as much as digits as its factorization.

1994739905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54387.

The product of its (nonzero) digits is 2755620, while the sum is 56.

The square root of 1994739905 is about 44662.5111810789. The cubic root of 1994739905 is about 1258.8155294014.

The spelling of 1994739905 in words is "one billion, nine hundred ninety-four million, seven hundred thirty-nine thousand, nine hundred five".