1215500 has 96 divisors (see below), whose sum is σ = 3302208. Its totient is φ = 384000.

The previous prime is 1215499. The next prime is 1215509. The reversal of 1215500 is 55121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71492 + ... + 71508.

It is an arithmetic number, because the mean of its divisors is an integer number (34398).

2^1215500 is an apocalyptic number.

1215500 is a gapful number since it is divisible by the number (10) 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 1215500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1651104).

1215500 is an abundant number, since it is smaller than the sum of its proper divisors (2086708).

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

1215500 is a wasteful number, since it uses less digits than its factorization.

1215500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60 (or 48 counting only the distinct ones).

The product of its (nonzero) digits is 50, while the sum is 14.

The square root of 1215500 is about 1102.4971655292. The cubic root of 1215500 is about 106.7214345483.

1215500 divided by its product of nonzero digits (50) gives a triangular number (24310 = T₂₂₀).

The spelling of 1215500 in words is "one million, two hundred fifteen thousand, five hundred".