1216917 has 16 divisors (see below), whose sum is σ = 1942080. Its totient is φ = 748656.

The previous prime is 1216913. The next prime is 1216937. The reversal of 1216917 is 7196121.

It is not a de Polignac number, because 1216917 - 2² = 1216913 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

1216917 is a lucky number.

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 15 ways as a sum of consecutive naturals, for example, 1383 + ... + 2084.

It is an arithmetic number, because the mean of its divisors is an integer number (121380).

2^1216917 is an apocalyptic number.

It is an amenable number.

1216917 is a deficient number, since it is larger than the sum of its proper divisors (725163).

1216917 is a wasteful number, since it uses less digits than its factorization.

1216917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3489 (or 3483 counting only the distinct ones).

The product of its digits is 756, while the sum is 27.

The square root of 1216917 is about 1103.1396103848. The cubic root of 1216917 is about 106.7628895178.

The spelling of 1216917 in words is "one million, two hundred sixteen thousand, nine hundred seventeen".