1216916 has 12 divisors (see below), whose sum is σ = 2157120. Its totient is φ = 600600.

The previous prime is 1216913. The next prime is 1216937. The reversal of 1216916 is 6196121.

1216916 = 83² + 84² + ... + 161².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1610 + ... + 2241.

It is an arithmetic number, because the mean of its divisors is an integer number (179760).

2^1216916 is an apocalyptic number.

It is an amenable number.

1216916 is a deficient number, since it is larger than the sum of its proper divisors (940204).

1216916 is a wasteful number, since it uses less digits than its factorization.

1216916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3934 (or 3932 counting only the distinct ones).

The product of its digits is 648, while the sum is 26.

The square root of 1216916 is about 1103.1391571330. The cubic root of 1216916 is about 106.7628602737.

The spelling of 1216916 in words is "one million, two hundred sixteen thousand, nine hundred sixteen".