1491459578240 has 128 divisors (see below), whose sum is σ = 3653881470720. Its totient is φ = 581972244480.

The previous prime is 1491459578131. The next prime is 1491459578249. The reversal of 1491459578240 is 428759541941.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a self number, because there is not a number n which added to its sum of digits gives 1491459578240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491459578249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4247795 + ... + 4585485.

It is an arithmetic number, because the mean of its divisors is an integer number (28545948990).

Almost surely, 2^{1491459578240} is an apocalyptic number.

1491459578240 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 1491459578240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1826940735360).

1491459578240 is an abundant number, since it is smaller than the sum of its proper divisors (2162421892480).

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

1491459578240 is a wasteful number, since it uses less digits than its factorization.

1491459578240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337880 (or 337868 counting only the distinct ones).

The product of its (nonzero) digits is 14515200, while the sum is 59.

The spelling of 1491459578240 in words is "one trillion, four hundred ninety-one billion, four hundred fifty-nine million, five hundred seventy-eight thousand, two hundred forty".