1216550 has 24 divisors (see below), whose sum is σ = 2343600. Its totient is φ = 469280.

The previous prime is 1216547. The next prime is 1216559. The reversal of 1216550 is 556121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1031 + ... + 1869.

It is an arithmetic number, because the mean of its divisors is an integer number (97650).

2^1216550 is an apocalyptic number.

1216550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1216550 is a deficient number, since it is larger than the sum of its proper divisors (1127050).

1216550 is a wasteful number, since it uses less digits than its factorization.

1216550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880 (or 875 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 1216550 is about 1102.9732544355. The cubic root of 1216550 is about 106.7521558578.

The spelling of 1216550 in words is "one million, two hundred sixteen thousand, five hundred fifty".