3138520 has 64 divisors (see below), whose sum is σ = 8812800. Its totient is φ = 977280.

The previous prime is 3138503. The next prime is 3138521. The reversal of 3138520 is 258313.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 3138491 and 3138500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3138521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2571 + ... + 3589.

It is an arithmetic number, because the mean of its divisors is an integer number (137700).

Almost surely, 2^3138520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3138520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4406400).

3138520 is an abundant number, since it is smaller than the sum of its proper divisors (5674280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3138520 is a wasteful number, since it uses less digits than its factorization.

3138520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1048 (or 1044 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 3138520 is about 1771.5868592875. The cubic root of 3138520 is about 146.4114247507.

The spelling of 3138520 in words is "three million, one hundred thirty-eight thousand, five hundred twenty".