1216755 has 16 divisors (see below), whose sum is σ = 2163360. Its totient is φ = 648864.

The previous prime is 1216751. The next prime is 1216759. The reversal of 1216755 is 5576121.

It is an interprime number because it is at equal distance from previous prime (1216751) and next prime (1216759).

It is not a de Polignac number, because 1216755 - 2² = 1216751 is a prime.

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

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

It is not an unprimeable number, because it can be changed into a prime (1216751) 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, 4372 + ... + 4641.

It is an arithmetic number, because the mean of its divisors is an integer number (135210).

2^1216755 is an apocalyptic number.

1216755 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1216755 is a deficient number, since it is larger than the sum of its proper divisors (946605).

1216755 is an equidigital number, since it uses as much as digits as its factorization.

1216755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9027 (or 9021 counting only the distinct ones).

The product of its digits is 2100, while the sum is 27.

The square root of 1216755 is about 1103.0661811514. The cubic root of 1216755 is about 106.7581517650.

The spelling of 1216755 in words is "one million, two hundred sixteen thousand, seven hundred fifty-five".