1215340245 has 96 divisors (see below), whose sum is σ = 2487663360. Its totient is φ = 537338880.

The previous prime is 1215340237. The next prime is 1215340249. The reversal of 1215340245 is 5420435121.

1215340245 is a `hidden beast` number, since 1 + 215 + 3 + 402 + 45 = 666.

It is not a de Polignac number, because 1215340245 - 2³ = 1215340237 is a prime.

It is a super-2 number, since 2×1215340245² = 2954103822233320050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215340249) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1794847 + ... + 1795523.

It is an arithmetic number, because the mean of its divisors is an integer number (25913160).

Almost surely, 2^1215340245 is an apocalyptic number.

1215340245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1215340245 is an abundant number, since it is smaller than the sum of its proper divisors (1272323115).

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

1215340245 is a wasteful number, since it uses less digits than its factorization.

1215340245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875 (or 872 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 1215340245 is about 34861.7303787405. The cubic root of 1215340245 is about 1067.1675882369.

Adding to 1215340245 its reverse (5420435121), we get a palindrome (6635775366).

The spelling of 1215340245 in words is "one billion, two hundred fifteen million, three hundred forty thousand, two hundred forty-five".