3129818 has 4 divisors (see below), whose sum is σ = 4694730. Its totient is φ = 1564908.

The previous prime is 3129811. The next prime is 3129821. The reversal of 3129818 is 8189213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8189213 = 73 ⋅112181.

It can be written as a sum of positive squares in only one way, i.e., 1868689 + 1261129 = 1367^2 + 1123^2 .

It is not an unprimeable number, because it can be changed into a prime (3129811) 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 as a sum of consecutive naturals, namely, 782453 + ... + 782456.

Almost surely, 2^3129818 is an apocalyptic number.

3129818 is a deficient number, since it is larger than the sum of its proper divisors (1564912).

3129818 is a wasteful number, since it uses less digits than its factorization.

3129818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1564911.

The product of its digits is 3456, while the sum is 32.

The square root of 3129818 is about 1769.1291643066. The cubic root of 3129818 is about 146.2759838898.

The spelling of 3129818 in words is "three million, one hundred twenty-nine thousand, eight hundred eighteen".