1215980 has 24 divisors (see below), whose sum is σ = 2576112. Its totient is φ = 482112.

The previous prime is 1215923. The next prime is 1216009. The reversal of 1215980 is 895121.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3074 + ... + 3446.

It is an arithmetic number, because the mean of its divisors is an integer number (107338).

2^1215980 is an apocalyptic number.

1215980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215980 is an abundant number, since it is smaller than the sum of its proper divisors (1360132).

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

1215980 is a wasteful number, since it uses less digits than its factorization.

1215980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545 (or 543 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 1215980 is about 1102.7148316768. The cubic root of 1215980 is about 106.7354807699.

The spelling of 1215980 in words is "one million, two hundred fifteen thousand, nine hundred eighty".