1216455 has 8 divisors (see below), whose sum is σ = 1946352. Its totient is φ = 648768.

The previous prime is 1216451. The next prime is 1216459. The reversal of 1216455 is 5546121.

It is an interprime number because it is at equal distance from previous prime (1216451) and next prime (1216459).

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

It is not a de Polignac number, because 1216455 - 2² = 1216451 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216451) 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, 40534 + ... + 40563.

It is an arithmetic number, because the mean of its divisors is an integer number (243294).

2^1216455 is an apocalyptic number.

1216455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1216455 is a deficient number, since it is larger than the sum of its proper divisors (729897).

1216455 is an equidigital number, since it uses as much as digits as its factorization.

1216455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81105.

The product of its digits is 1200, while the sum is 24.

The square root of 1216455 is about 1102.9301881806. The cubic root of 1216455 is about 106.7493770382.

The spelling of 1216455 in words is "one million, two hundred sixteen thousand, four hundred fifty-five".