1215240013 has 8 divisors (see below), whose sum is σ = 1319026688. Its totient is φ = 1112925744.

The previous prime is 1215239999. The next prime is 1215240017. The reversal of 1215240013 is 3100425121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1215240013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215240017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 366381 + ... + 369682.

It is an arithmetic number, because the mean of its divisors is an integer number (164878336).

Almost surely, 2^1215240013 is an apocalyptic number.

1215240013 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1215240013 is a deficient number, since it is larger than the sum of its proper divisors (103786675).

1215240013 is a wasteful number, since it uses less digits than its factorization.

1215240013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736203.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1215240013 is about 34860.2927841979. The cubic root of 1215240013 is about 1067.1382501474.

Adding to 1215240013 its reverse (3100425121), we get a palindrome (4315665134).

The spelling of 1215240013 in words is "one billion, two hundred fifteen million, two hundred forty thousand, thirteen".