1215520 has 48 divisors (see below), whose sum is σ = 2939328. Its totient is φ = 474880.

The previous prime is 1215509. The next prime is 1215521. The reversal of 1215520 is 255121.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 1215494 and 1215503.

It is not an unprimeable number, because it can be changed into a prime (1215521) 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, 11307 + ... + 11413.

It is an arithmetic number, because the mean of its divisors is an integer number (61236).

2^1215520 is an apocalyptic number.

1215520 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 1215520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1469664).

1215520 is an abundant number, since it is smaller than the sum of its proper divisors (1723808).

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

1215520 is a wasteful number, since it uses less digits than its factorization.

1215520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193 (or 185 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 1215520 is about 1102.5062358100. The cubic root of 1215520 is about 106.7220198813.

The spelling of 1215520 in words is "one million, two hundred fifteen thousand, five hundred twenty".