3901993 has 4 divisors (see below), whose sum is σ = 4131540. Its totient is φ = 3672448.

The previous prime is 3901981. The next prime is 3901999. The reversal of 3901993 is 3991093.

It is a happy number.

3901993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1172889 + 2729104 = 1083^2 + 1652^2 .

It is a cyclic number.

It is not a de Polignac number, because 3901993 - 2⁹ = 3901481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3901999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114748 + ... + 114781.

It is an arithmetic number, because the mean of its divisors is an integer number (1032885).

Almost surely, 2^3901993 is an apocalyptic number.

It is an amenable number.

3901993 is a deficient number, since it is larger than the sum of its proper divisors (229547).

3901993 is a wasteful number, since it uses less digits than its factorization.

3901993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229546.

The product of its (nonzero) digits is 6561, while the sum is 34.

The square root of 3901993 is about 1975.3462987537. The cubic root of 3901993 is about 157.4328999467.

The spelling of 3901993 in words is "three million, nine hundred one thousand, nine hundred ninety-three".