1213760 has 28 divisors (see below), whose sum is σ = 2891028. Its totient is φ = 485376.

The previous prime is 1213759. The next prime is 1213763. The reversal of 1213760 is 673121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 322624 + 891136 = 568^2 + 944^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213763) 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, 1577 + ... + 2216.

It is an arithmetic number, because the mean of its divisors is an integer number (103251).

2^1213760 is an apocalyptic number.

1213760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213760 is an abundant number, since it is smaller than the sum of its proper divisors (1677268).

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

1213760 is an equidigital number, since it uses as much as digits as its factorization.

1213760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3810 (or 3800 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 1213760 is about 1101.7077652445. The cubic root of 1213760 is about 106.6704859744.

Adding to 1213760 its reverse (673121), we get a palindrome (1886881).

The spelling of 1213760 in words is "one million, two hundred thirteen thousand, seven hundred sixty".