3894789905 has 4 divisors (see below), whose sum is σ = 4673747892. Its totient is φ = 3115831920.

The previous prime is 3894789901. The next prime is 3894789949. The reversal of 3894789905 is 5099874983.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1753599376 + 2141190529 = 41876^2 + 46273^2 .

It is not a de Polignac number, because 3894789905 - 2² = 3894789901 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3894789901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 389478986 + ... + 389478995.

It is an arithmetic number, because the mean of its divisors is an integer number (1168436973).

Almost surely, 2^3894789905 is an apocalyptic number.

It is an amenable number.

3894789905 is a deficient number, since it is larger than the sum of its proper divisors (778957987).

3894789905 is an equidigital number, since it uses as much as digits as its factorization.

3894789905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778957986.

The product of its (nonzero) digits is 19595520, while the sum is 62.

The square root of 3894789905 is about 62408.2518982867. The cubic root of 3894789905 is about 1573.3596635039.

The spelling of 3894789905 in words is "three billion, eight hundred ninety-four million, seven hundred eighty-nine thousand, nine hundred five".