1219855 has 24 divisors (see below), whose sum is σ = 1838592. Its totient is φ = 770112.

The previous prime is 1219849. The next prime is 1219859. The reversal of 1219855 is 5589121.

It is not a de Polignac number, because 1219855 - 2³ = 1219847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1219859) 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 23 ways as a sum of consecutive naturals, for example, 2994 + ... + 3376.

It is an arithmetic number, because the mean of its divisors is an integer number (76608).

2^1219855 is an apocalyptic number.

1219855 is a deficient number, since it is larger than the sum of its proper divisors (618737).

1219855 is a wasteful number, since it uses less digits than its factorization.

1219855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415 (or 408 counting only the distinct ones).

The product of its digits is 3600, while the sum is 31.

The square root of 1219855 is about 1104.4704613524. The cubic root of 1219855 is about 106.8487396010.

The spelling of 1219855 in words is "one million, two hundred nineteen thousand, eight hundred fifty-five".