3891329 has 4 divisors (see below), whose sum is σ = 4190676. Its totient is φ = 3591984.

The previous prime is 3891323. The next prime is 3891331. The reversal of 3891329 is 9231983.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 300304 + 3591025 = 548^2 + 1895^2 .

It is a cyclic number.

It is not a de Polignac number, because 3891329 - 2¹⁶ = 3825793 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3891323) 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, 149654 + ... + 149679.

It is an arithmetic number, because the mean of its divisors is an integer number (1047669).

Almost surely, 2^3891329 is an apocalyptic number.

It is an amenable number.

3891329 is a deficient number, since it is larger than the sum of its proper divisors (299347).

3891329 is a wasteful number, since it uses less digits than its factorization.

3891329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299346.

The product of its digits is 11664, while the sum is 35.

The square root of 3891329 is about 1972.6451784343. The cubic root of 3891329 is about 157.2893496981.

The spelling of 3891329 in words is "three million, eight hundred ninety-one thousand, three hundred twenty-nine".