3998932649 has 4 divisors (see below), whose sum is σ = 3999525060. Its totient is φ = 3998340240.

The previous prime is 3998932591. The next prime is 3998932669. The reversal of 3998932649 is 9462398993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9462398993 = 557 ⋅16988149.

It can be written as a sum of positive squares in 2 ways, for example, as 791409424 + 3207523225 = 28132^2 + 56635^2 .

It is a cyclic number.

It is not a de Polignac number, because 3998932649 - 2⁸ = 3998932393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3998932591 and 3998932600.

It is not an unprimeable number, because it can be changed into a prime (3998932669) 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, 285962 + ... + 299619.

It is an arithmetic number, because the mean of its divisors is an integer number (999881265).

Almost surely, 2^3998932649 is an apocalyptic number.

It is an amenable number.

3998932649 is a deficient number, since it is larger than the sum of its proper divisors (592411).

3998932649 is an equidigital number, since it uses as much as digits as its factorization.

3998932649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592410.

The product of its digits is 22674816, while the sum is 62.

The square root of 3998932649 is about 63237.1144898310. The cubic root of 3998932649 is about 1587.2598465661.

The spelling of 3998932649 in words is "three billion, nine hundred ninety-eight million, nine hundred thirty-two thousand, six hundred forty-nine".