3128805 has 24 divisors (see below), whose sum is σ = 5660928. Its totient is φ = 1595616.

The previous prime is 3128803. The next prime is 3128813. The reversal of 3128805 is 5088213.

It is a happy number.

It is not a de Polignac number, because 3128805 - 2¹ = 3128803 is a prime.

It is a Curzon number.

3128805 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3128803) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 477 + ... + 2546.

It is an arithmetic number, because the mean of its divisors is an integer number (235872).

Almost surely, 2^3128805 is an apocalyptic number.

It is an amenable number.

3128805 is a deficient number, since it is larger than the sum of its proper divisors (2532123).

3128805 is a wasteful number, since it uses less digits than its factorization.

3128805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3057 (or 3054 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 3128805 is about 1768.8428420863. The cubic root of 3128805 is about 146.2602009102.

The spelling of 3128805 in words is "three million, one hundred twenty-eight thousand, eight hundred five".