1216578 has 16 divisors (see below), whose sum is σ = 2654496. Its totient is φ = 368640.

The previous prime is 1216577. The next prime is 1216583. The reversal of 1216578 is 8756121.

It is not an unprimeable number, because it can be changed into a prime (1216577) 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, 9151 + ... + 9282.

It is an arithmetic number, because the mean of its divisors is an integer number (165906).

2^1216578 is an apocalyptic number.

1216578 is an abundant number, since it is smaller than the sum of its proper divisors (1437918).

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

1216578 is a wasteful number, since it uses less digits than its factorization.

1216578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18449.

The product of its digits is 3360, while the sum is 30.

The square root of 1216578 is about 1102.9859473266. The cubic root of 1216578 is about 106.7529748507.

The spelling of 1216578 in words is "one million, two hundred sixteen thousand, five hundred seventy-eight".