3138813 has 6 divisors (see below), whose sum is σ = 4533854. Its totient is φ = 2092536.

The previous prime is 3138809. The next prime is 3138847. The reversal of 3138813 is 3188313.

It can be written as a sum of positive squares in only one way, i.e., 1633284 + 1505529 = 1278^2 + 1227^2 .

It is not a de Polignac number, because 3138813 - 2² = 3138809 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 (3138803) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 174370 + ... + 174387.

Almost surely, 2^3138813 is an apocalyptic number.

It is an amenable number.

3138813 is a deficient number, since it is larger than the sum of its proper divisors (1395041).

3138813 is a wasteful number, since it uses less digits than its factorization.

3138813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348763 (or 348760 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 3138813 is about 1771.6695515812. The cubic root of 3138813 is about 146.4159807423.

The spelling of 3138813 in words is "three million, one hundred thirty-eight thousand, eight hundred thirteen".