1215602772 has 12 divisors (see below), whose sum is σ = 2836406496. Its totient is φ = 405200920.

The previous prime is 1215602747. The next prime is 1215602821. The reversal of 1215602772 is 2772065121.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50650104 + ... + 50650127.

It is an arithmetic number, because the mean of its divisors is an integer number (236367208).

Almost surely, 2^1215602772 is an apocalyptic number.

1215602772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1215602772 is an abundant number, since it is smaller than the sum of its proper divisors (1620803724).

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

1215602772 is a wasteful number, since it uses less digits than its factorization.

1215602772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101300238 (or 101300236 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 1215602772 is about 34865.4954360325. The cubic root of 1215602772 is about 1067.2444227246.

Adding to 1215602772 its reverse (2772065121), we get a palindrome (3987667893).

The spelling of 1215602772 in words is "one billion, two hundred fifteen million, six hundred two thousand, seven hundred seventy-two".