1205440 has 28 divisors (see below), whose sum is σ = 2871216. Its totient is φ = 482048.

The previous prime is 1205437. The next prime is 1205447. The reversal of 1205440 is 445021.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (1205447) 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 3 ways as a sum of consecutive naturals, for example, 1564 + ... + 2203.

2^1205440 is an apocalyptic number.

1205440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1205440 is an abundant number, since it is smaller than the sum of its proper divisors (1665776).

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

1205440 is an equidigital number, since it uses as much as digits as its factorization.

1205440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3784 (or 3774 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 1205440 is about 1097.9253162215. The cubic root of 1205440 is about 106.4261943912.

The spelling of 1205440 in words is "one million, two hundred five thousand, four hundred forty".