3998733667 has 4 divisors (see below), whose sum is σ = 4005387736. Its totient is φ = 3992079600.

The previous prime is 3998733653. The next prime is 3998733707. The reversal of 3998733667 is 7663378993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7663378993 = 23 ⋅333190391.

It is a cyclic number.

It is not a de Polignac number, because 3998733667 - 2¹⁵ = 3998700899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3998733647) 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, 3326133 + ... + 3327334.

It is an arithmetic number, because the mean of its divisors is an integer number (1001346934).

Almost surely, 2^3998733667 is an apocalyptic number.

3998733667 is a deficient number, since it is larger than the sum of its proper divisors (6654069).

3998733667 is an equidigital number, since it uses as much as digits as its factorization.

3998733667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6654068.

The product of its digits is 30862944, while the sum is 61.

The square root of 3998733667 is about 63235.5411695037. The cubic root of 3998733667 is about 1587.2335194263.

The spelling of 3998733667 in words is "three billion, nine hundred ninety-eight million, seven hundred thirty-three thousand, six hundred sixty-seven".