3998920565 has 8 divisors (see below), whose sum is σ = 4828145568. Its totient is φ = 3179509200.

The previous prime is 3998920559. The next prime is 3998920603. The reversal of 3998920565 is 5650298993.

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

It is not a de Polignac number, because 3998920565 - 2¹² = 3998916469 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3998920565.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2452511 + ... + 2454140.

It is an arithmetic number, because the mean of its divisors is an integer number (603518196).

Almost surely, 2^3998920565 is an apocalyptic number.

It is an amenable number.

3998920565 is a deficient number, since it is larger than the sum of its proper divisors (829225003).

3998920565 is a wasteful number, since it uses less digits than its factorization.

3998920565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4906819.

The product of its (nonzero) digits is 5248800, while the sum is 56.

The square root of 3998920565 is about 63237.0189446024. The cubic root of 3998920565 is about 1587.2582477672.

The spelling of 3998920565 in words is "three billion, nine hundred ninety-eight million, nine hundred twenty thousand, five hundred sixty-five".