3997777993 has 4 divisors (see below), whose sum is σ = 4361212368. Its totient is φ = 3634343620.

The previous prime is 3997777891. The next prime is 3997778003.

3997777993 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3997777993 - 2¹³ = 3997769801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3997777093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181717171 + ... + 181717192.

It is an arithmetic number, because the mean of its divisors is an integer number (1090303092).

Almost surely, 2^3997777993 is an apocalyptic number.

It is an amenable number.

3997777993 is a deficient number, since it is larger than the sum of its proper divisors (363434375).

3997777993 is a wasteful number, since it uses less digits than its factorization.

3997777993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363434374.

The product of its digits is 141776649, while the sum is 70.

The square root of 3997777993 is about 63227.9842553912. The cubic root of 3997777993 is about 1587.1070628369.

The spelling of 3997777993 in words is "three billion, nine hundred ninety-seven million, seven hundred seventy-seven thousand, nine hundred ninety-three".