1216965 has 8 divisors (see below), whose sum is σ = 1947168. Its totient is φ = 649040.

The previous prime is 1216961. The next prime is 1216973. The reversal of 1216965 is 5696121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1216965 - 2² = 1216961 is a prime.

It is a super-2 number, since 2×1216965² = 2962007622450, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216961) 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, 40551 + ... + 40580.

It is an arithmetic number, because the mean of its divisors is an integer number (243396).

2^1216965 is an apocalyptic number.

1216965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1216965 is a deficient number, since it is larger than the sum of its proper divisors (730203).

1216965 is an equidigital number, since it uses as much as digits as its factorization.

1216965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81139.

The product of its digits is 3240, while the sum is 30.

The square root of 1216965 is about 1103.1613662561. The cubic root of 1216965 is about 106.7642932156.

The spelling of 1216965 in words is "one million, two hundred sixteen thousand, nine hundred sixty-five".