3998036639 has 8 divisors (see below), whose sum is σ = 4230497280. Its totient is φ = 3767779800.

The previous prime is 3998036629. The next prime is 3998036641. The reversal of 3998036639 is 9366308993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3998036639 - 2²⁰ = 3996988063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3998036629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 547217 + ... + 554474.

It is an arithmetic number, because the mean of its divisors is an integer number (528812160).

Almost surely, 2^3998036639 is an apocalyptic number.

3998036639 is a deficient number, since it is larger than the sum of its proper divisors (232460641).

3998036639 is a wasteful number, since it uses less digits than its factorization.

3998036639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101901.

The product of its (nonzero) digits is 5668704, while the sum is 56.

The square root of 3998036639 is about 63230.0295666545. The cubic root of 3998036639 is about 1587.1412893532.

The spelling of 3998036639 in words is "three billion, nine hundred ninety-eight million, thirty-six thousand, six hundred thirty-nine".