1215996 has 12 divisors (see below), whose sum is σ = 2837352. Its totient is φ = 405328.

The previous prime is 1215923. The next prime is 1216009. The reversal of 1215996 is 6995121.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50655 + ... + 50678.

It is an arithmetic number, because the mean of its divisors is an integer number (236446).

2^1215996 is an apocalyptic number.

It is an amenable number.

1215996 is an abundant number, since it is smaller than the sum of its proper divisors (1621356).

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

1215996 is a wasteful number, since it uses less digits than its factorization.

1215996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101340 (or 101338 counting only the distinct ones).

The product of its digits is 4860, while the sum is 33.

The square root of 1215996 is about 1102.7220864751. The cubic root of 1215996 is about 106.7359489136.

It can be divided in two parts, 1215 and 996, that added together give a triangular number (2211 = T₆₆).

The spelling of 1215996 in words is "one million, two hundred fifteen thousand, nine hundred ninety-six".