1205520 has 40 divisors (see below), whose sum is σ = 3737856. Its totient is φ = 321408.

The previous prime is 1205513. The next prime is 1205527. The reversal of 1205520 is 255021.

It is an interprime number because it is at equal distance from previous prime (1205513) and next prime (1205527).

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1205520.

It is not an unprimeable number, because it can be changed into a prime (1205527) 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, 2272 + ... + 2751.

2^1205520 is an apocalyptic number.

1205520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1205520 is an abundant number, since it is smaller than the sum of its proper divisors (2532336).

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

1205520 is a wasteful number, since it uses less digits than its factorization.

1205520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5039 (or 5033 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 1205520 is about 1097.9617479676. The cubic root of 1205520 is about 106.4285486926.

The spelling of 1205520 in words is "one million, two hundred five thousand, five hundred twenty".