3998449009 has 2 divisors, whose sum is σ = 3998449010. Its totient is φ = 3998449008.

The previous prime is 3998448989. The next prime is 3998449033. The reversal of 3998449009 is 9009448993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3891264400 + 107184609 = 62380^2 + 10353^2 .

It is a cyclic number.

It is not a de Polignac number, because 3998449009 - 2¹⁷ = 3998317937 is a prime.

It is not a weakly prime, because it can be changed into another prime (3998429009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1999224504 + 1999224505.

It is an arithmetic number, because the mean of its divisors is an integer number (1999224505).

Almost surely, 2^3998449009 is an apocalyptic number.

It is an amenable number.

3998449009 is a deficient number, since it is larger than the sum of its proper divisors (1).

3998449009 is an equidigital number, since it uses as much as digits as its factorization.

3998449009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2519424, while the sum is 55.

The square root of 3998449009 is about 63233.2903540532. The cubic root of 3998449009 is about 1587.1958550489.

The spelling of 3998449009 in words is "three billion, nine hundred ninety-eight million, four hundred forty-nine thousand, nine".