3998820139 has 2 divisors, whose sum is σ = 3998820140. Its totient is φ = 3998820138.

The previous prime is 3998820109. The next prime is 3998820187. The reversal of 3998820139 is 9310288993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3998820139 - 2⁷ = 3998820011 is a prime.

It is not a weakly prime, because it can be changed into another prime (3998820109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1999410069 + 1999410070.

It is an arithmetic number, because the mean of its divisors is an integer number (1999410070).

Almost surely, 2^3998820139 is an apocalyptic number.

3998820139 is a deficient number, since it is larger than the sum of its proper divisors (1).

3998820139 is an equidigital number, since it uses as much as digits as its factorization.

3998820139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 839808, while the sum is 52.

The square root of 3998820139 is about 63236.2248952292. The cubic root of 3998820139 is about 1587.2449605706.

The spelling of 3998820139 in words is "three billion, nine hundred ninety-eight million, eight hundred twenty thousand, one hundred thirty-nine".