1216730 has 16 divisors (see below), whose sum is σ = 2202984. Its totient is φ = 483840.

The previous prime is 1216729. The next prime is 1216751. The reversal of 1216730 is 376121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 833569 + 383161 = 913^2 + 619^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2594 + ... + 3026.

2^1216730 is an apocalyptic number.

1216730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1216730 is a deficient number, since it is larger than the sum of its proper divisors (986254).

1216730 is a wasteful number, since it uses less digits than its factorization.

1216730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721.

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

The square root of 1216730 is about 1103.0548490442. The cubic root of 1216730 is about 106.7574205929.

The spelling of 1216730 in words is "one million, two hundred sixteen thousand, seven hundred thirty".