1491015240 has 288 divisors, whose sum is σ = 5738274360. Its totient is φ = 333527040.

The previous prime is 1491015221. The next prime is 1491015247. The reversal of 1491015240 is 425101941.

It can be written as a sum of positive squares in 4 ways, for example, as 659154276 + 831860964 = 25674^2 + 28842^2 .

It is not an unprimeable number, because it can be changed into a prime (1491015247) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 564964 + ... + 567596.

Almost surely, 2^1491015240 is an apocalyptic number.

1491015240 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 1491015240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2869137180).

1491015240 is an abundant number, since it is smaller than the sum of its proper divisors (4247259120).

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

1491015240 is a wasteful number, since it uses less digits than its factorization.

1491015240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2685 (or 2667 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1491015240 is about 38613.6664925775. Note that the first 3 decimals coincide. The cubic root of 1491015240 is about 1142.4241122244.

The spelling of 1491015240 in words is "one billion, four hundred ninety-one million, fifteen thousand, two hundred forty".