3121403040 has 336 divisors, whose sum is σ = 12639207168. Its totient is φ = 713276928.

The previous prime is 3121402967. The next prime is 3121403063. The reversal of 3121403040 is 403041213.

It is a tau number, because it is divible by the number of its divisors (336).

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

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 55 ways as a sum of consecutive naturals, for example, 814569 + ... + 818391.

It is an arithmetic number, because the mean of its divisors is an integer number (37616688).

Almost surely, 2^3121403040 is an apocalyptic number.

3121403040 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 3121403040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6319603584).

3121403040 is an abundant number, since it is smaller than the sum of its proper divisors (9517804128).

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

3121403040 is an equidigital number, since it uses as much as digits as its factorization.

3121403040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3863 (or 3840 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 3121403040 is about 55869.5179861076. The cubic root of 3121403040 is about 1461.4477164257.

Adding to 3121403040 its reverse (403041213), we get a palindrome (3524444253).

The spelling of 3121403040 in words is "three billion, one hundred twenty-one million, four hundred three thousand, forty".