3904421 has 4 divisors (see below), whose sum is σ = 3942432. Its totient is φ = 3866412.

The previous prime is 3904409. The next prime is 3904447. The reversal of 3904421 is 1244093.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1244093 = 23 ⋅54091.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3904421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3904321) 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, 18851 + ... + 19056.

It is an arithmetic number, because the mean of its divisors is an integer number (985608).

Almost surely, 2^3904421 is an apocalyptic number.

It is an amenable number.

3904421 is a deficient number, since it is larger than the sum of its proper divisors (38011).

3904421 is a wasteful number, since it uses less digits than its factorization.

3904421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38010.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 3904421 is about 1975.9607789630. The cubic root of 3904421 is about 157.4655471798.

The spelling of 3904421 in words is "three million, nine hundred four thousand, four hundred twenty-one".