3904987 has 4 divisors (see below), whose sum is σ = 3978720. Its totient is φ = 3831256.

The previous prime is 3904981. The next prime is 3904997. The reversal of 3904987 is 7894093.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3904987 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3904981) 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, 36787 + ... + 36892.

It is an arithmetic number, because the mean of its divisors is an integer number (994680).

Almost surely, 2^3904987 is an apocalyptic number.

3904987 is a deficient number, since it is larger than the sum of its proper divisors (73733).

3904987 is an equidigital number, since it uses as much as digits as its factorization.

3904987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73732.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 3904987 is about 1976.1039952391. The cubic root of 3904987 is about 157.4731557508.

The spelling of 3904987 in words is "three million, nine hundred four thousand, nine hundred eighty-seven".