3990055843 has 2 divisors, whose sum is σ = 3990055844. Its totient is φ = 3990055842.

The previous prime is 3990055837. The next prime is 3990055897. The reversal of 3990055843 is 3485500993.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3990055843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3990055793 and 3990055802.

It is not a weakly prime, because it can be changed into another prime (3990055943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1995027921 + 1995027922.

It is an arithmetic number, because the mean of its divisors is an integer number (1995027922).

Almost surely, 2^3990055843 is an apocalyptic number.

3990055843 is a deficient number, since it is larger than the sum of its proper divisors (1).

3990055843 is an equidigital number, since it uses as much as digits as its factorization.

3990055843 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 583200, while the sum is 46.

The square root of 3990055843 is about 63166.8888184308. Note that the first 4 decimals coincide. The cubic root of 3990055843 is about 1586.0845132689.

The spelling of 3990055843 in words is "three billion, nine hundred ninety million, fifty-five thousand, eight hundred forty-three".