3929872 has 40 divisors (see below), whose sum is σ = 8124480. Its totient is φ = 1837440.

The previous prime is 3929857. The next prime is 3929879. The reversal of 3929872 is 2789293.

It is not an unprimeable number, because it can be changed into a prime (3929879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21622 + ... + 21802.

It is an arithmetic number, because the mean of its divisors is an integer number (203112).

Almost surely, 2^3929872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3929872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4062240).

3929872 is an abundant number, since it is smaller than the sum of its proper divisors (4194608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3929872 is a wasteful number, since it uses less digits than its factorization.

3929872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271 (or 265 counting only the distinct ones).

The product of its digits is 54432, while the sum is 40.

The square root of 3929872 is about 1982.3904761676. The cubic root of 3929872 is about 157.8069532475.

The spelling of 3929872 in words is "three million, nine hundred twenty-nine thousand, eight hundred seventy-two".