1215041540 has 48 divisors (see below), whose sum is σ = 2634242688. Its totient is φ = 470475264.

The previous prime is 1215041537. The next prime is 1215041543. The reversal of 1215041540 is 451405121.

It is an interprime number because it is at equal distance from previous prime (1215041537) and next prime (1215041543).

It is not an unprimeable number, because it can be changed into a prime (1215041543) 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, 90929 + ... + 103431.

It is an arithmetic number, because the mean of its divisors is an integer number (54880056).

Almost surely, 2^1215041540 is an apocalyptic number.

1215041540 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 1215041540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1317121344).

1215041540 is an abundant number, since it is smaller than the sum of its proper divisors (1419201148).

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

1215041540 is a wasteful number, since it uses less digits than its factorization.

1215041540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12668 (or 12666 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 1215041540 is about 34857.4459764338. The cubic root of 1215041540 is about 1067.0801519778.

Adding to 1215041540 its reverse (451405121), we get a palindrome (1666446661).

The spelling of 1215041540 in words is "one billion, two hundred fifteen million, forty-one thousand, five hundred forty".