3121042340 has 96 divisors (see below), whose sum is σ = 7292799360. Its totient is φ = 1114638336.

The previous prime is 3121042333. The next prime is 3121042343. The reversal of 3121042340 is 432401213.

It is a super-3 number, since 3×3121042340³ (a number of 29 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (3121042343) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1194956 + ... + 1197564.

It is an arithmetic number, because the mean of its divisors is an integer number (75966660).

Almost surely, 2^3121042340 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3121042340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3646399680).

3121042340 is an abundant number, since it is smaller than the sum of its proper divisors (4171757020).

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

3121042340 is a wasteful number, since it uses less digits than its factorization.

3121042340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2781 (or 2779 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 3121042340 is about 55866.2898356424. The cubic root of 3121042340 is about 1461.3914207481.

Adding to 3121042340 its reverse (432401213), we get a palindrome (3553443553).

The spelling of 3121042340 in words is "three billion, one hundred twenty-one million, forty-two thousand, three hundred forty".