1215648 has 120 divisors (see below), whose sum is σ = 4146912. Its totient is φ = 342144.

The previous prime is 1215647. The next prime is 1215649. The reversal of 1215648 is 8465121.

1215648 is a `hidden beast` number, since 1 + 2 + 15 + 648 = 666.

It is an interprime number because it is at equal distance from previous prime (1215647) and next prime (1215649).

It is a super-3 number, since 3×1215648³ = 5389454061666533376, which contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

Its product of digits (1920) is a multiple of the sum of its prime factors (96).

It is not an unprimeable number, because it can be changed into a prime (1215647) 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 19 ways as a sum of consecutive naturals, for example, 18111 + ... + 18177.

2^1215648 is an apocalyptic number.

1215648 is a gapful number since it is divisible by the number (18) 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 1215648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2073456).

1215648 is an abundant number, since it is smaller than the sum of its proper divisors (2931264).

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

1215648 is an equidigital number, since it uses as much as digits as its factorization.

1215648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96 (or 79 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 1215648 is about 1102.5642838402. The cubic root of 1215648 is about 106.7257658609.

The spelling of 1215648 in words is "one million, two hundred fifteen thousand, six hundred forty-eight".