3929985 has 32 divisors (see below), whose sum is σ = 7159680. Its totient is φ = 2044224.

The previous prime is 3929977. The next prime is 3930001. The reversal of 3929985 is 5899293.

It is not a de Polignac number, because 3929985 - 2³ = 3929977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 3929985.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5467 + ... + 6143.

It is an arithmetic number, because the mean of its divisors is an integer number (223740).

Almost surely, 2^3929985 is an apocalyptic number.

It is an amenable number.

3929985 is a deficient number, since it is larger than the sum of its proper divisors (3229695).

3929985 is a wasteful number, since it uses less digits than its factorization.

3929985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734 (or 728 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 3929985 is about 1982.4189769067. The cubic root of 3929985 is about 157.8084657662.

The spelling of 3929985 in words is "three million, nine hundred twenty-nine thousand, nine hundred eighty-five".