3981309 has 8 divisors (see below), whose sum is σ = 5317632. Its totient is φ = 2649600.

The previous prime is 3981301. The next prime is 3981331. The reversal of 3981309 is 9031893.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3981309 - 2³ = 3981301 is a prime.

3981309 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3981309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3981301) 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, 2877 + ... + 4029.

It is an arithmetic number, because the mean of its divisors is an integer number (664704).

Almost surely, 2^3981309 is an apocalyptic number.

It is an amenable number.

3981309 is a deficient number, since it is larger than the sum of its proper divisors (1336323).

3981309 is a wasteful number, since it uses less digits than its factorization.

3981309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2307.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 3981309 is about 1995.3217785610. The cubic root of 3981309 is about 158.4924681378.

The spelling of 3981309 in words is "three million, nine hundred eighty-one thousand, three hundred nine".