1217320 has 32 divisors (see below), whose sum is σ = 2950920. Its totient is φ = 449280.

The previous prime is 1217317. The next prime is 1217329. The reversal of 1217320 is 237121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 850084 + 367236 = 922^2 + 606^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1217294 and 1217303.

It is not an unprimeable number, because it can be changed into a prime (1217329) 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, 651 + ... + 1690.

2^1217320 is an apocalyptic number.

1217320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1217320 is an abundant number, since it is smaller than the sum of its proper divisors (1733600).

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

1217320 is a wasteful number, since it uses less digits than its factorization.

1217320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2365 (or 2361 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 1217320 is about 1103.3222557349. The cubic root of 1217320 is about 106.7746735852.

The spelling of 1217320 in words is "one million, two hundred seventeen thousand, three hundred twenty".