1215000 has 120 divisors (see below), whose sum is σ = 4264260. Its totient is φ = 324000.

The previous prime is 1214981. The next prime is 1215017. The reversal of 1215000 is 5121.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

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 29 ways as a sum of consecutive naturals, for example, 242998 + ... + 243002.

2^1215000 is an apocalyptic number.

1215000 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 1215000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2132130).

1215000 is an abundant number, since it is smaller than the sum of its proper divisors (3049260).

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

1215000 is an frugal number, since it uses more digits than its factorization.

1215000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41 (or 10 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 9.

The square root of 1215000 is about 1102.2703842524. The cubic root of 1215000 is about 106.7067991347.

The spelling of 1215000 in words is "one million, two hundred fifteen thousand".