1215156 has 24 divisors (see below), whose sum is σ = 2860704. Its totient is φ = 401440.

The previous prime is 1215133. The next prime is 1215157. The reversal of 1215156 is 6515121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215157) 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, 1186 + ... + 1958.

It is an arithmetic number, because the mean of its divisors is an integer number (119196).

2^1215156 is an apocalyptic number.

It is an amenable number.

1215156 is an abundant number, since it is smaller than the sum of its proper divisors (1645548).

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

1215156 is a wasteful number, since it uses less digits than its factorization.

1215156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 911 (or 909 counting only the distinct ones).

The product of its digits is 300, while the sum is 21.

The square root of 1215156 is about 1102.3411450182. The cubic root of 1215156 is about 106.7113658146.

The spelling of 1215156 in words is "one million, two hundred fifteen thousand, one hundred fifty-six".