3949721 has 8 divisors (see below), whose sum is σ = 4173120. Its totient is φ = 3730672.

The previous prime is 3949711. The next prime is 3949723. The reversal of 3949721 is 1279493.

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 3949721 - 2⁶ = 3949657 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3949723) 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, 875 + ... + 2943.

It is an arithmetic number, because the mean of its divisors is an integer number (521640).

Almost surely, 2^3949721 is an apocalyptic number.

It is an amenable number.

3949721 is a deficient number, since it is larger than the sum of its proper divisors (223399).

3949721 is a wasteful number, since it uses less digits than its factorization.

3949721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2175.

The product of its digits is 13608, while the sum is 35.

The square root of 3949721 is about 1987.3905001282. The cubic root of 3949721 is about 158.0721910131.

The spelling of 3949721 in words is "three million, nine hundred forty-nine thousand, seven hundred twenty-one".