1216340 has 24 divisors (see below), whose sum is σ = 2598792. Its totient is φ = 478080.

The previous prime is 1216339. The next prime is 1216349. The reversal of 1216340 is 436121.

It can be written as a sum of positive squares in 4 ways, for example, as 58564 + 1157776 = 242^2 + 1076^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216349) 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, 722 + ... + 1718.

It is an arithmetic number, because the mean of its divisors is an integer number (108283).

2^1216340 is an apocalyptic number.

1216340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216340 is an abundant number, since it is smaller than the sum of its proper divisors (1382452).

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

1216340 is a wasteful number, since it uses less digits than its factorization.

1216340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1067 (or 1065 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1216340 is about 1102.8780530956. The cubic root of 1216340 is about 106.7460130105.

The spelling of 1216340 in words is "one million, two hundred sixteen thousand, three hundred forty".