3997817817 has 16 divisors (see below), whose sum is σ = 6191782272. Its totient is φ = 2247016320.

The previous prime is 3997817809. The next prime is 3997817819. The reversal of 3997817817 is 7187187993.

It is not a de Polignac number, because 3997817817 - 2³ = 3997817809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3997817819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1559148 + ... + 1561709.

It is an arithmetic number, because the mean of its divisors is an integer number (386986392).

Almost surely, 2^3997817817 is an apocalyptic number.

It is an amenable number.

3997817817 is a deficient number, since it is larger than the sum of its proper divisors (2193964455).

3997817817 is a wasteful number, since it uses less digits than its factorization.

3997817817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3120928.

The product of its digits is 5334336, while the sum is 60.

The square root of 3997817817 is about 63228.2991784533. The cubic root of 3997817817 is about 1587.1123328262.

The spelling of 3997817817 in words is "three billion, nine hundred ninety-seven million, eight hundred seventeen thousand, eight hundred seventeen".