1355240 has 32 divisors (see below), whose sum is σ = 3230280. Its totient is φ = 509952.

The previous prime is 1355219. The next prime is 1355243. The reversal of 1355240 is 425531.

It can be written as a sum of positive squares in 4 ways, for example, as 1304164 + 51076 = 1142^2 + 226^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1355243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 317 + ... + 1676.

2^1355240 is an apocalyptic number.

1355240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1355240 is an abundant number, since it is smaller than the sum of its proper divisors (1875040).

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

1355240 is a wasteful number, since it uses less digits than its factorization.

1355240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2021 (or 2017 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 1355240 is about 1164.1477569450. The cubic root of 1355240 is about 110.6637553467.

The spelling of 1355240 in words is "one million, three hundred fifty-five thousand, two hundred forty".