1217965 has 32 divisors (see below), whose sum is σ = 1866240. Its totient is φ = 743424.

The previous prime is 1217963. The next prime is 1217977. The reversal of 1217965 is 5697121.

1217965 = T₁₂₅ + T₁₂₆ + ... + T₂₀₉.

It is a 6-Lehmer number, since φ(1217965) divides (1217965-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 1217965 - 2¹ = 1217963 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13641 + ... + 13729.

It is an arithmetic number, because the mean of its divisors is an integer number (58320).

2^1217965 is an apocalyptic number.

It is an amenable number.

1217965 is a deficient number, since it is larger than the sum of its proper divisors (648275).

1217965 is a wasteful number, since it uses less digits than its factorization.

1217965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141.

The product of its digits is 3780, while the sum is 31.

The square root of 1217965 is about 1103.6145160336. The cubic root of 1217965 is about 106.7935285301.

It can be divided in two parts, 121796 and 5, that added together give a square (121801 = 349²).

The spelling of 1217965 in words is "one million, two hundred seventeen thousand, nine hundred sixty-five".