1268840 has 16 divisors (see below), whose sum is σ = 2854980. Its totient is φ = 507520.

The previous prime is 1268807. The next prime is 1268843. The reversal of 1268840 is 488621.

It can be written as a sum of positive squares in 2 ways, for example, as 1094116 + 174724 = 1046^2 + 418^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1268843) 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, 15821 + ... + 15900.

2^1268840 is an apocalyptic number.

1268840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1268840 is an abundant number, since it is smaller than the sum of its proper divisors (1586140).

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

1268840 is a wasteful number, since it uses less digits than its factorization.

1268840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31732 (or 31728 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 1268840 is about 1126.4279826070. The cubic root of 1268840 is about 108.2602320776.

The spelling of 1268840 in words is "one million, two hundred sixty-eight thousand, eight hundred forty".