3121688 has 8 divisors (see below), whose sum is σ = 5853180. Its totient is φ = 1560840.

The previous prime is 3121667. The next prime is 3121691. The reversal of 3121688 is 8861213.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 3121688.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195098 + ... + 195113.

Almost surely, 2^3121688 is an apocalyptic number.

It is an amenable number.

3121688 is a deficient number, since it is larger than the sum of its proper divisors (2731492).

3121688 is a wasteful number, since it uses less digits than its factorization.

3121688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390217 (or 390213 counting only the distinct ones).

The product of its digits is 2304, while the sum is 29.

The square root of 3121688 is about 1766.8299295631. The cubic root of 3121688 is about 146.1492188037.

The spelling of 3121688 in words is "three million, one hundred twenty-one thousand, six hundred eighty-eight".