3909993 has 4 divisors (see below), whose sum is σ = 5213328. Its totient is φ = 2606660.

The previous prime is 3909979. The next prime is 3910001. The reversal of 3909993 is 3999093.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3909993 - 2⁹ = 3909481 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (3909923) 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 in 3 ways as a sum of consecutive naturals, for example, 651663 + ... + 651668.

It is an arithmetic number, because the mean of its divisors is an integer number (1303332).

Almost surely, 2^3909993 is an apocalyptic number.

It is an amenable number.

3909993 is a deficient number, since it is larger than the sum of its proper divisors (1303335).

3909993 is a wasteful number, since it uses less digits than its factorization.

3909993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1303334.

The product of its (nonzero) digits is 59049, while the sum is 42.

The square root of 3909993 is about 1977.3702233016. The cubic root of 3909993 is about 157.5404179465.

The spelling of 3909993 in words is "three million, nine hundred nine thousand, nine hundred ninety-three".