1215872 has 64 divisors (see below), whose sum is σ = 2937600. Its totient is φ = 489984.

The previous prime is 1215859. The next prime is 1215881. The reversal of 1215872 is 2785121.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20579 + ... + 20637.

It is an arithmetic number, because the mean of its divisors is an integer number (45900).

2^1215872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1215872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1468800).

1215872 is an abundant number, since it is smaller than the sum of its proper divisors (1721728).

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

1215872 is an equidigital number, since it uses as much as digits as its factorization.

1215872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103 (or 91 counting only the distinct ones).

The product of its digits is 1120, while the sum is 26.

The square root of 1215872 is about 1102.6658605398. The cubic root of 1215872 is about 106.7323206923.

The spelling of 1215872 in words is "one million, two hundred fifteen thousand, eight hundred seventy-two".