3129389 has 4 divisors (see below), whose sum is σ = 3133020. Its totient is φ = 3125760.

The previous prime is 3129383. The next prime is 3129391. The reversal of 3129389 is 9839213.

3129389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 828100 + 2301289 = 910^2 + 1517^2 .

It is a cyclic number.

It is not a de Polignac number, because 3129389 - 2¹² = 3125293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3129383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 299 + ... + 2519.

It is an arithmetic number, because the mean of its divisors is an integer number (783255).

Almost surely, 2^3129389 is an apocalyptic number.

It is an amenable number.

3129389 is a deficient number, since it is larger than the sum of its proper divisors (3631).

3129389 is a wasteful number, since it uses less digits than its factorization.

3129389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3630.

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

The square root of 3129389 is about 1769.0079140580. The cubic root of 3129389 is about 146.2693002994.

The spelling of 3129389 in words is "three million, one hundred twenty-nine thousand, three hundred eighty-nine".