3904393 has 4 divisors (see below), whose sum is σ = 3914820. Its totient is φ = 3893968.

The previous prime is 3904387. The next prime is 3904409. The reversal of 3904393 is 3934093.

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 1108809 + 2795584 = 1053^2 + 1672^2 .

It is a cyclic number.

It is not a de Polignac number, because 3904393 - 2⁹ = 3903881 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

3904393 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3904333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4630 + ... + 5407.

It is an arithmetic number, because the mean of its divisors is an integer number (978705).

Almost surely, 2^3904393 is an apocalyptic number.

It is an amenable number.

3904393 is a deficient number, since it is larger than the sum of its proper divisors (10427).

3904393 is a wasteful number, since it uses less digits than its factorization.

3904393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10426.

The product of its (nonzero) digits is 8748, while the sum is 31.

The square root of 3904393 is about 1975.9536937894. The cubic root of 3904393 is about 157.4651707649.

The spelling of 3904393 in words is "three million, nine hundred four thousand, three hundred ninety-three".