3935721 has 8 divisors (see below), whose sum is σ = 5556384. Its totient is φ = 2469440.

The previous prime is 3935719. The next prime is 3935753. The reversal of 3935721 is 1275393.

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 3935721 - 2¹ = 3935719 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3935761) 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, 38535 + ... + 38636.

It is an arithmetic number, because the mean of its divisors is an integer number (694548).

Almost surely, 2^3935721 is an apocalyptic number.

It is an amenable number.

3935721 is a deficient number, since it is larger than the sum of its proper divisors (1620663).

3935721 is a wasteful number, since it uses less digits than its factorization.

3935721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77191.

The product of its digits is 5670, while the sum is 30.

The square root of 3935721 is about 1983.8651667893. The cubic root of 3935721 is about 157.8852047637.

It can be divided in two parts, 3935 and 721, that added together give a triangular number (4656 = T₉₆).

The spelling of 3935721 in words is "three million, nine hundred thirty-five thousand, seven hundred twenty-one".