1266240 has 56 divisors (see below), whose sum is σ = 4023360. Its totient is φ = 337408.

The previous prime is 1266229. The next prime is 1266241. The reversal of 1266240 is 426621.

It is a happy number.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1266241) 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 7 ways as a sum of consecutive naturals, for example, 301 + ... + 1619.

2^1266240 is an apocalyptic number.

1266240 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 1266240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2011680).

1266240 is an abundant number, since it is smaller than the sum of its proper divisors (2757120).

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

1266240 is a wasteful number, since it uses less digits than its factorization.

1266240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1339 (or 1329 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1266240 is about 1125.2733001365. The cubic root of 1266240 is about 108.1862355974.

The spelling of 1266240 in words is "one million, two hundred sixty-six thousand, two hundred forty".