1215880 has 32 divisors (see below), whose sum is σ = 2770200. Its totient is φ = 480256.

The previous prime is 1215859. The next prime is 1215881. The reversal of 1215880 is 885121.

It can be written as a sum of positive squares in 4 ways, for example, as 298116 + 917764 = 546^2 + 958^2 .

It is not an unprimeable number, because it can be changed into a prime (1215881) 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, 4386 + ... + 4654.

2^1215880 is an apocalyptic number.

1215880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215880 is an abundant number, since it is smaller than the sum of its proper divisors (1554320).

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

1215880 is a wasteful number, since it uses less digits than its factorization.

1215880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393 (or 389 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 1215880 is about 1102.6694881060. The cubic root of 1215880 is about 106.7325547786.

The spelling of 1215880 in words is "one million, two hundred fifteen thousand, eight hundred eighty".