3974821 has 8 divisors (see below), whose sum is σ = 4278744. Its totient is φ = 3678720.

The previous prime is 3974801. The next prime is 3974833. The reversal of 3974821 is 1284793.

It can be written as a sum of positive squares in 4 ways, for example, as 30625 + 3944196 = 175^2 + 1986^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3974821 - 2⁹ = 3974309 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 (3974801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 880 + ... + 2953.

It is an arithmetic number, because the mean of its divisors is an integer number (534843).

Almost surely, 2^3974821 is an apocalyptic number.

It is an amenable number.

3974821 is a deficient number, since it is larger than the sum of its proper divisors (303923).

3974821 is a wasteful number, since it uses less digits than its factorization.

3974821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3911.

The product of its digits is 12096, while the sum is 34.

The square root of 3974821 is about 1993.6953127296. The cubic root of 3974821 is about 158.4063274391.

The spelling of 3974821 in words is "three million, nine hundred seventy-four thousand, eight hundred twenty-one".