3121884 has 18 divisors (see below), whose sum is σ = 7891520. Its totient is φ = 1040616.

The previous prime is 3121873. The next prime is 3121891. The reversal of 3121884 is 4881213.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 43324 + ... + 43395.

Almost surely, 2^3121884 is an apocalyptic number.

It is an amenable number.

3121884 is an abundant number, since it is smaller than the sum of its proper divisors (4769636).

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

3121884 is a wasteful number, since it uses less digits than its factorization.

3121884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86729 (or 86724 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 3121884 is about 1766.8853952648. The cubic root of 3121884 is about 146.1522774745.

It can be divided in two parts, 3121 and 884, that added together give a triangular number (4005 = T₈₉).

The spelling of 3121884 in words is "three million, one hundred twenty-one thousand, eight hundred eighty-four".