3997997993 has 8 divisors (see below), whose sum is σ = 4591002720. Its totient is φ = 3443251680.

The previous prime is 3997997959. The next prime is 3997998013.

3997997993 is nontrivially palindromic in base 10.

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

It is not a de Polignac number, because 3997997993 - 2¹⁶ = 3997932457 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 3997997993.

It is not an unprimeable number, because it can be changed into a prime (3997997093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9564380 + ... + 9564797.

It is an arithmetic number, because the mean of its divisors is an integer number (573875340).

Almost surely, 2^3997997993 is an apocalyptic number.

It is an amenable number.

3997997993 is a deficient number, since it is larger than the sum of its proper divisors (593004727).

3997997993 is a wasteful number, since it uses less digits than its factorization.

3997997993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19129207.

The product of its digits is 234365481, while the sum is 74.

The square root of 3997997993 is about 63229.7239674506. The cubic root of 3997997993 is about 1587.1361754381.

The spelling of 3997997993 in words is "three billion, nine hundred ninety-seven million, nine hundred ninety-seven thousand, nine hundred ninety-three".