1215240 has 128 divisors (see below), whose sum is σ = 4233600. Its totient is φ = 276480.

The previous prime is 1215239. The next prime is 1215271. The reversal of 1215240 is 425121.

It is a Harshad number since it is a multiple of its sum of digits (15).

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 31 ways as a sum of consecutive naturals, for example, 29620 + ... + 29660.

It is an arithmetic number, because the mean of its divisors is an integer number (33075).

2^1215240 is an apocalyptic number.

1215240 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 1215240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2116800).

1215240 is an abundant number, since it is smaller than the sum of its proper divisors (3018360).

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

1215240 is a wasteful number, since it uses less digits than its factorization.

1215240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87 (or 83 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 1215240 is about 1102.3792450876. The cubic root of 1215240 is about 106.7138246342.

It can be divided in two parts, 1215 and 240, that multiplied together give a square (291600 = 540²).

The spelling of 1215240 in words is "one million, two hundred fifteen thousand, two hundred forty".