3998820826 has 144 divisors (see below), whose sum is σ = 8581168512. Its totient is φ = 1359737280.

The previous prime is 3998820803. The next prime is 3998820857. The reversal of 3998820826 is 6280288993.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 7949691 + ... + 7950193.

It is an arithmetic number, because the mean of its divisors is an integer number (59591448).

Almost surely, 2^3998820826 is an apocalyptic number.

3998820826 is an abundant number, since it is smaller than the sum of its proper divisors (4582347686).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3998820826 is a wasteful number, since it uses less digits than its factorization.

3998820826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585 (or 555 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 55.

The square root of 3998820826 is about 63236.2303272420. The cubic root of 3998820826 is about 1587.2450514672.

The spelling of 3998820826 in words is "three billion, nine hundred ninety-eight million, eight hundred twenty thousand, eight hundred twenty-six".