1215514540 has 48 divisors (see below), whose sum is σ = 2645153280. Its totient is φ = 468861120.

The previous prime is 1215514523. The next prime is 1215514571. The reversal of 1215514540 is 454155121.

It is a junction number, because it is equal to n+sod(n) for n = 1215514499 and 1215514508.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58995 + ... + 76885.

It is an arithmetic number, because the mean of its divisors is an integer number (55107360).

Almost surely, 2^1215514540 is an apocalyptic number.

1215514540 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 1215514540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1322576640).

1215514540 is an abundant number, since it is smaller than the sum of its proper divisors (1429638740).

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

1215514540 is a wasteful number, since it uses less digits than its factorization.

1215514540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18022 (or 18020 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 28.

The square root of 1215514540 is about 34864.2300933206. The cubic root of 1215514540 is about 1067.2186008606.

Adding to 1215514540 its reverse (454155121), we get a palindrome (1669669661).

The spelling of 1215514540 in words is "one billion, two hundred fifteen million, five hundred fourteen thousand, five hundred forty".