3994994989 has 2 divisors, whose sum is σ = 3994994990. Its totient is φ = 3994994988.

The previous prime is 3994994957. The next prime is 3994995029. The reversal of 3994994989 is 9894994993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2712638889 + 1282356100 = 52083^2 + 35810^2 .

It is a cyclic number.

It is not a de Polignac number, because 3994994989 - 2⁵ = 3994994957 is a prime.

It is a super-2 number, since 2×3994994989² = 31919969924270220242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3994994909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1997497494 + 1997497495.

It is an arithmetic number, because the mean of its divisors is an integer number (1997497495).

Almost surely, 2^3994994989 is an apocalyptic number.

It is an amenable number.

3994994989 is a deficient number, since it is larger than the sum of its proper divisors (1).

3994994989 is an equidigital number, since it uses as much as digits as its factorization.

3994994989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204073344, while the sum is 73.

The square root of 3994994989 is about 63205.9727320132. The cubic root of 3994994989 is about 1586.7386956557.

The spelling of 3994994989 in words is "three billion, nine hundred ninety-four million, nine hundred ninety-four thousand, nine hundred eighty-nine".