1221803 has 8 divisors (see below), whose sum is σ = 1376256. Its totient is φ = 1074600.

The previous prime is 1221793. The next prime is 1221811. The reversal of 1221803 is 3081221.

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

It is a cyclic number.

It is not a de Polignac number, because 1221803 - 2¹⁸ = 959659 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221823) 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, 1451 + ... + 2132.

It is an arithmetic number, because the mean of its divisors is an integer number (172032).

2^1221803 is an apocalyptic number.

1221803 is a deficient number, since it is larger than the sum of its proper divisors (154453).

1221803 is a wasteful number, since it uses less digits than its factorization.

1221803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3625.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1221803 is about 1105.3519801403. The cubic root of 1221803 is about 106.9055853322.

The spelling of 1221803 in words is "one million, two hundred twenty-one thousand, eight hundred three".