3985729 has 4 divisors (see below), whose sum is σ = 4348080. Its totient is φ = 3623380.

The previous prime is 3985721. The next prime is 3985777. The reversal of 3985729 is 9275893.

It is a happy number.

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 3985729 - 2³ = 3985721 is a prime.

It is a super-2 number, since 2×3985729² = 31772071322882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3985721) 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, 181159 + ... + 181180.

It is an arithmetic number, because the mean of its divisors is an integer number (1087020).

Almost surely, 2^3985729 is an apocalyptic number.

It is an amenable number.

3985729 is a deficient number, since it is larger than the sum of its proper divisors (362351).

3985729 is a wasteful number, since it uses less digits than its factorization.

3985729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362350.

The product of its digits is 136080, while the sum is 43.

The square root of 3985729 is about 1996.4290621006. The cubic root of 3985729 is about 158.5510985721.

The spelling of 3985729 in words is "three million, nine hundred eighty-five thousand, seven hundred twenty-nine".