3128920 has 64 divisors (see below), whose sum is σ = 7776000. Its totient is φ = 1127808.

The previous prime is 3128893. The next prime is 3128921. The reversal of 3128920 is 298213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3128921) 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, 17391 + ... + 17569.

It is an arithmetic number, because the mean of its divisors is an integer number (121500).

Almost surely, 2^3128920 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 3128920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3888000).

3128920 is an abundant number, since it is smaller than the sum of its proper divisors (4647080).

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

3128920 is a wasteful number, since it uses less digits than its factorization.

3128920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232 (or 228 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 3128920 is about 1768.8753489152. The cubic root of 3128920 is about 146.2619928315.

It can be divided in two parts, 3 and 128920, that multiplied together give a triangular number (386760 = T₈₇₉).

The spelling of 3128920 in words is "three million, one hundred twenty-eight thousand, nine hundred twenty".