3905999 has 2 divisors, whose sum is σ = 3906000. Its totient is φ = 3905998.

The previous prime is 3905987. The next prime is 3906017. The reversal of 3905999 is 9995093.

It is a weak prime.

It is an emirp because it is prime and its reverse (9995093) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3905999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3905299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1952999 + 1953000.

It is an arithmetic number, because the mean of its divisors is an integer number (1953000).

Almost surely, 2^3905999 is an apocalyptic number.

3905999 is a deficient number, since it is larger than the sum of its proper divisors (1).

3905999 is an equidigital number, since it uses as much as digits as its factorization.

3905999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 98415, while the sum is 44.

The square root of 3905999 is about 1976.3600380497. The cubic root of 3905999 is about 157.4867579360.

The spelling of 3905999 in words is "three million, nine hundred five thousand, nine hundred ninety-nine".