1216375 has 16 divisors (see below), whose sum is σ = 1564992. Its totient is φ = 943200.

The previous prime is 1216373. The next prime is 1216379. The reversal of 1216375 is 5736121.

1216375 = 163² + 164² + ... + 199².

It is not a de Polignac number, because 1216375 - 2¹ = 1216373 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

Its product of digits (1260) is a multiple of the sum of its prime factors (315).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4494 + ... + 4756.

It is an arithmetic number, because the mean of its divisors is an integer number (97812).

2^1216375 is an apocalyptic number.

1216375 is a deficient number, since it is larger than the sum of its proper divisors (348617).

1216375 is an equidigital number, since it uses as much as digits as its factorization.

1216375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315 (or 305 counting only the distinct ones).

The product of its digits is 1260, while the sum is 25.

The square root of 1216375 is about 1102.8939205563. The cubic root of 1216375 is about 106.7470368674.

The spelling of 1216375 in words is "one million, two hundred sixteen thousand, three hundred seventy-five".