3111721440 has 48 divisors (see below), whose sum is σ = 9801924048. Its totient is φ = 829792256.

The previous prime is 3111721439. The next prime is 3111721453. The reversal of 3111721440 is 441271113.

3111721440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 3111721440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3240897 + ... + 3241856.

It is an arithmetic number, because the mean of its divisors is an integer number (204206751).

Almost surely, 2^3111721440 is an apocalyptic number.

3111721440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3111721440 is an abundant number, since it is smaller than the sum of its proper divisors (6690202608).

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

3111721440 is a wasteful number, since it uses less digits than its factorization.

3111721440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6482771 (or 6482763 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 3111721440 is about 55782.8059530892. The cubic root of 3111721440 is about 1459.9351694488.

Adding to 3111721440 its reverse (441271113), we get a palindrome (3552992553).

The spelling of 3111721440 in words is "three billion, one hundred eleven million, seven hundred twenty-one thousand, four hundred forty".