3998551817 has 16 divisors (see below), whose sum is σ = 4495830528. Its totient is φ = 3528550080.

The previous prime is 3998551807. The next prime is 3998551819. The reversal of 3998551817 is 7181558993.

3998551817 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 3998551817 - 2⁸ = 3998551561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3998551819) 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, 970592 + ... + 974702.

It is an arithmetic number, because the mean of its divisors is an integer number (280989408).

Almost surely, 2^3998551817 is an apocalyptic number.

It is an amenable number.

3998551817 is a deficient number, since it is larger than the sum of its proper divisors (497278711).

3998551817 is a wasteful number, since it uses less digits than its factorization.

3998551817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7400.

The product of its digits is 2721600, while the sum is 56.

The square root of 3998551817 is about 63234.1032750525. The cubic root of 3998551817 is about 1587.2094582430.

The spelling of 3998551817 in words is "three billion, nine hundred ninety-eight million, five hundred fifty-one thousand, eight hundred seventeen".