3998220823 has 2 divisors, whose sum is σ = 3998220824. Its totient is φ = 3998220822.

The previous prime is 3998220761. The next prime is 3998220829. The reversal of 3998220823 is 3280228993.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3998220823 - 2⁹ = 3998220311 is a prime.

It is a super-3 number, since 3×3998220823³ (a number of 30 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3998220829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1999110411 + 1999110412.

It is an arithmetic number, because the mean of its divisors is an integer number (1999110412).

Almost surely, 2^3998220823 is an apocalyptic number.

3998220823 is a deficient number, since it is larger than the sum of its proper divisors (1).

3998220823 is an equidigital number, since it uses as much as digits as its factorization.

3998220823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 3998220823 is about 63231.4860097404. The cubic root of 3998220823 is about 1587.1656614445.

The spelling of 3998220823 in words is "three billion, nine hundred ninety-eight million, two hundred twenty thousand, eight hundred twenty-three".