1215984 has 120 divisors (see below), whose sum is σ = 4071168. Its totient is φ = 309120.

The previous prime is 1215923. The next prime is 1216009. The reversal of 1215984 is 4895121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25849 + ... + 25895.

2^1215984 is an apocalyptic number.

1215984 is a gapful number since it is divisible by the number (14) 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 1215984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2035584).

1215984 is an abundant number, since it is smaller than the sum of its proper divisors (2855184).

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

1215984 is a wasteful number, since it uses less digits than its factorization.

1215984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83 (or 70 counting only the distinct ones).

The product of its digits is 2880, while the sum is 30.

The square root of 1215984 is about 1102.7166453809. The cubic root of 1215984 is about 106.7355978062.

It can be divided in two parts, 121 and 5984, that added together give a triangular number (6105 = T₁₁₀).

The spelling of 1215984 in words is "one million, two hundred fifteen thousand, nine hundred eighty-four".