1170721440 has 576 divisors, whose sum is σ = 4863995136. Its totient is φ = 250822656.

The previous prime is 1170721429. The next prime is 1170721441. The reversal of 1170721440 is 441270711.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1170721441) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 16037244 + ... + 16037316.

It is an arithmetic number, because the mean of its divisors is an integer number (8444436).

Almost surely, 2^1170721440 is an apocalyptic number.

1170721440 is a gapful number since it is divisible by the number (10) 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 1170721440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2431997568).

1170721440 is an abundant number, since it is smaller than the sum of its proper divisors (3693273696).

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

1170721440 is a wasteful number, since it uses less digits than its factorization.

1170721440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 170 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 1170721440 is about 34215.8068734321. The cubic root of 1170721440 is about 1053.9447802110.

The spelling of 1170721440 in words is "one billion, one hundred seventy million, seven hundred twenty-one thousand, four hundred forty".