3997719919 has 4 divisors (see below), whose sum is σ = 4135572360. Its totient is φ = 3859867480.

The previous prime is 3997719911. The next prime is 3997719941. The reversal of 3997719919 is 9199177993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9199177993 = 15263 ⋅602711.

It is a cyclic number.

It is not a de Polignac number, because 3997719919 - 2³ = 3997719911 is a prime.

It is a super-2 number, since 2×3997719919² = 31963529101538733122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3997719911) 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 3 ways as a sum of consecutive naturals, for example, 68926177 + ... + 68926234.

It is an arithmetic number, because the mean of its divisors is an integer number (1033893090).

Almost surely, 2^3997719919 is an apocalyptic number.

3997719919 is a deficient number, since it is larger than the sum of its proper divisors (137852441).

3997719919 is a wasteful number, since it uses less digits than its factorization.

3997719919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137852440.

The product of its digits is 8680203, while the sum is 64.

The square root of 3997719919 is about 63227.5250108685. The cubic root of 3997719919 is about 1587.0993777260.

The spelling of 3997719919 in words is "three billion, nine hundred ninety-seven million, seven hundred nineteen thousand, nine hundred nineteen".