3894946891 has 32 divisors (see below), whose sum is σ = 4774464000. Its totient is φ = 3133447680.

The previous prime is 3894946879. The next prime is 3894946963. The reversal of 3894946891 is 1986494983.

It is not a de Polignac number, because 3894946891 - 2⁵ = 3894946859 is a prime.

It is a super-2 number, since 2×3894946891² = 30341222567421131762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3894946801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 246085 + ... + 261433.

It is an arithmetic number, because the mean of its divisors is an integer number (149202000).

Almost surely, 2^3894946891 is an apocalyptic number.

3894946891 is a deficient number, since it is larger than the sum of its proper divisors (879517109).

3894946891 is a wasteful number, since it uses less digits than its factorization.

3894946891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15459.

The product of its digits is 13436928, while the sum is 61.

The square root of 3894946891 is about 62409.5096199289. The cubic root of 3894946891 is about 1573.3808021813.

The spelling of 3894946891 in words is "three billion, eight hundred ninety-four million, nine hundred forty-six thousand, eight hundred ninety-one".