1213660 has 24 divisors (see below), whose sum is σ = 2913120. Its totient is φ = 416064.

The previous prime is 1213657. The next prime is 1213661. The reversal of 1213660 is 663121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4195 + ... + 4474.

It is an arithmetic number, because the mean of its divisors is an integer number (121380).

2^1213660 is an apocalyptic number.

1213660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213660 is an abundant number, since it is smaller than the sum of its proper divisors (1699460).

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

1213660 is a wasteful number, since it uses less digits than its factorization.

1213660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8685 (or 8683 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1213660 is about 1101.6623802236. The cubic root of 1213660 is about 106.6675564162.

Adding to 1213660 its reverse (663121), we get a palindrome (1876781).

The spelling of 1213660 in words is "one million, two hundred thirteen thousand, six hundred sixty".