3998798877 has 4 divisors (see below), whose sum is σ = 5331731840. Its totient is φ = 2665865916.

The previous prime is 3998798873. The next prime is 3998798977. The reversal of 3998798877 is 7788978993.

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 not a de Polignac number, because 3998798877 - 2² = 3998798873 is a prime.

It is a super-2 number, since 2×3998798877² = 31980784917392922258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3998798799 and 3998798808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3998798873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 666466477 + ... + 666466482.

It is an arithmetic number, because the mean of its divisors is an integer number (1332932960).

Almost surely, 2^3998798877 is an apocalyptic number.

It is an amenable number.

3998798877 is a deficient number, since it is larger than the sum of its proper divisors (1332932963).

3998798877 is a wasteful number, since it uses less digits than its factorization.

3998798877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332932962.

The product of its digits is 384072192, while the sum is 75.

The square root of 3998798877 is about 63236.0567793407. The cubic root of 3998798877 is about 1587.2421474023.

The spelling of 3998798877 in words is "three billion, nine hundred ninety-eight million, seven hundred ninety-eight thousand, eight hundred seventy-seven".