3990047 has 2 divisors, whose sum is σ = 3990048. Its totient is φ = 3990046.

The previous prime is 3990037. The next prime is 3990061. The reversal of 3990047 is 7400993.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (7400993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3990047 - 2⁴ = 3990031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3989995 and 3990022.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3990037) 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, 1995023 + 1995024.

It is an arithmetic number, because the mean of its divisors is an integer number (1995024).

Almost surely, 2^3990047 is an apocalyptic number.

3990047 is a deficient number, since it is larger than the sum of its proper divisors (1).

3990047 is an equidigital number, since it uses as much as digits as its factorization.

3990047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 3990047 is about 1997.5102002243. The cubic root of 3990047 is about 158.6083341543.

The spelling of 3990047 in words is "three million, nine hundred ninety thousand, forty-seven".