3121020 has 72 divisors (see below), whose sum is σ = 10823904. Its totient is φ = 713088.

The previous prime is 3121007. The next prime is 3121033. The reversal of 3121020 is 201213.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (3121007) and next prime (3121033).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 3120993 and 3121011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22 + ... + 2498.

It is an arithmetic number, because the mean of its divisors is an integer number (150332).

Almost surely, 2^3121020 is an apocalyptic number.

3121020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3121020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5411952).

3121020 is an abundant number, since it is smaller than the sum of its proper divisors (7702884).

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

3121020 is a wasteful number, since it uses less digits than its factorization.

3121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2499 (or 2494 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 3121020 is about 1766.6408803150. The cubic root of 3121020 is about 146.1387933926.

Adding to 3121020 its reverse (201213), we get a palindrome (3322233).

The spelling of 3121020 in words is "three million, one hundred twenty-one thousand, twenty".