3974721 has 4 divisors (see below), whose sum is σ = 5299632. Its totient is φ = 2649812.

The previous prime is 3974717. The next prime is 3974723. The reversal of 3974721 is 1274793.

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.

It is a cyclic number.

It is not a de Polignac number, because 3974721 - 2² = 3974717 is a prime.

It is a D-number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3974723) 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, 662451 + ... + 662456.

It is an arithmetic number, because the mean of its divisors is an integer number (1324908).

Almost surely, 2^3974721 is an apocalyptic number.

It is an amenable number.

3974721 is a deficient number, since it is larger than the sum of its proper divisors (1324911).

3974721 is a wasteful number, since it uses less digits than its factorization.

3974721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324910.

The product of its digits is 10584, while the sum is 33.

The square root of 3974721 is about 1993.6702335141. The cubic root of 3974721 is about 158.4049990132.

The spelling of 3974721 in words is "three million, nine hundred seventy-four thousand, seven hundred twenty-one".