3981729 has 8 divisors (see below), whose sum is σ = 5492160. Its totient is φ = 2562896.

The previous prime is 3981709. The next prime is 3981739. The reversal of 3981729 is 9271893.

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 3981729 - 2⁸ = 3981473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3981709) 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, 22797 + ... + 22970.

It is an arithmetic number, because the mean of its divisors is an integer number (686520).

Almost surely, 2^3981729 is an apocalyptic number.

It is an amenable number.

3981729 is a deficient number, since it is larger than the sum of its proper divisors (1510431).

3981729 is a wasteful number, since it uses less digits than its factorization.

3981729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45799.

The product of its digits is 27216, while the sum is 39.

The square root of 3981729 is about 1995.4270219680. The cubic root of 3981729 is about 158.4980412208.

The spelling of 3981729 in words is "three million, nine hundred eighty-one thousand, seven hundred twenty-nine".