1215912 has 32 divisors (see below), whose sum is σ = 3146400. Its totient is φ = 391104.

The previous prime is 1215899. The next prime is 1215917. The reversal of 1215912 is 2195121.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1215917) 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, 178 + ... + 1569.

It is an arithmetic number, because the mean of its divisors is an integer number (98325).

2^1215912 is an apocalyptic number.

1215912 is a gapful number since it is divisible by the number (12) 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 1215912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1573200).

1215912 is an abundant number, since it is smaller than the sum of its proper divisors (1930488).

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

1215912 is a wasteful number, since it uses less digits than its factorization.

1215912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1785 (or 1781 counting only the distinct ones).

The product of its digits is 180, while the sum is 21.

The square root of 1215912 is about 1102.6839982515. The cubic root of 1215912 is about 106.7334911132.

The spelling of 1215912 in words is "one million, two hundred fifteen thousand, nine hundred twelve".