1215040 has 28 divisors (see below), whose sum is σ = 2894076. Its totient is φ = 485888.

The previous prime is 1215029. The next prime is 1215047. The reversal of 1215040 is 405121.

It can be written as a sum of positive squares in 2 ways, for example, as 166464 + 1048576 = 408^2 + 1024^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1215040.

It is not an unprimeable number, because it can be changed into a prime (1215047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1579 + ... + 2218.

2^1215040 is an apocalyptic number.

1215040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215040 is an abundant number, since it is smaller than the sum of its proper divisors (1679036).

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

1215040 is an equidigital number, since it uses as much as digits as its factorization.

1215040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3814 (or 3804 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 1215040 is about 1102.2885284716. The cubic root of 1215040 is about 106.7079701155.

The spelling of 1215040 in words is "one million, two hundred fifteen thousand, forty".