3784721 has 8 divisors (see below), whose sum is σ = 3858624. Its totient is φ = 3711760.

The previous prime is 3784691. The next prime is 3784723. The reversal of 3784721 is 1274873.

It is a happy number.

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 3784721 - 2⁶ = 3784657 is a prime.

It is a super-2 number, since 2×3784721² = 28648226095682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3784723) 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, 21791 + ... + 21963.

It is an arithmetic number, because the mean of its divisors is an integer number (482328).

Almost surely, 2^3784721 is an apocalyptic number.

It is an amenable number.

3784721 is a deficient number, since it is larger than the sum of its proper divisors (73903).

3784721 is a wasteful number, since it uses less digits than its factorization.

3784721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471.

The product of its digits is 9408, while the sum is 32.

The square root of 3784721 is about 1945.4359408626. The cubic root of 3784721 is about 155.8396473050.

The spelling of 3784721 in words is "three million, seven hundred eighty-four thousand, seven hundred twenty-one".