1221928 has 16 divisors (see below), whose sum is σ = 2412000. Its totient is φ = 578736.

The previous prime is 1221917. The next prime is 1221937. The reversal of 1221928 is 8291221.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3868 + ... + 4171.

It is an arithmetic number, because the mean of its divisors is an integer number (150750).

2^1221928 is an apocalyptic number.

It is an amenable number.

1221928 is a deficient number, since it is larger than the sum of its proper divisors (1190072).

1221928 is a wasteful number, since it uses less digits than its factorization.

1221928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8064 (or 8060 counting only the distinct ones).

The product of its digits is 576, while the sum is 25.

The square root of 1221928 is about 1105.4085217692. The cubic root of 1221928 is about 106.9092309670.

The spelling of 1221928 in words is "one million, two hundred twenty-one thousand, nine hundred twenty-eight".