1221854 has 8 divisors (see below), whose sum is σ = 1843560. Its totient is φ = 607336.

The previous prime is 1221853. The next prime is 1221863. The reversal of 1221854 is 4581221.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221853) 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 3 ways as a sum of consecutive naturals, for example, 1349 + ... + 2064.

It is an arithmetic number, because the mean of its divisors is an integer number (230445).

2^1221854 is an apocalyptic number.

1221854 is a deficient number, since it is larger than the sum of its proper divisors (621706).

1221854 is a wasteful number, since it uses less digits than its factorization.

1221854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3594.

The product of its digits is 640, while the sum is 23.

The square root of 1221854 is about 1105.3750494742. The cubic root of 1221854 is about 106.9070727812.

The spelling of 1221854 in words is "one million, two hundred twenty-one thousand, eight hundred fifty-four".