3121740 has 120 divisors (see below), whose sum is σ = 10245312. Its totient is φ = 794880.

The previous prime is 3121739. The next prime is 3121747. The reversal of 3121740 is 471213.

3121740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (3121747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 66397 + ... + 66443.

Almost surely, 2^3121740 is an apocalyptic number.

3121740 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 3121740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5122656).

3121740 is an abundant number, since it is smaller than the sum of its proper divisors (7123572).

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

3121740 is a wasteful number, since it uses less digits than its factorization.

3121740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109 (or 98 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 3121740 is about 1766.8446451231. The cubic root of 3121740 is about 146.1500303003.

Adding to 3121740 its reverse (471213), we get a palindrome (3592953).

The spelling of 3121740 in words is "three million, one hundred twenty-one thousand, seven hundred forty".