1921228 has 12 divisors (see below), whose sum is σ = 3372712. Its totient is φ = 957600.

The previous prime is 1921211. The next prime is 1921229. The reversal of 1921228 is 8221291.

It is a super-2 number, since 2×1921228² = 7382234055968, which contains 22 as substring.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1921229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1303 + ... + 2353.

2^1921228 is an apocalyptic number.

It is an amenable number.

1921228 is a deficient number, since it is larger than the sum of its proper divisors (1451484).

1921228 is a wasteful number, since it uses less digits than its factorization.

1921228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1512 (or 1510 counting only the distinct ones).

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

The square root of 1921228 is about 1386.0836915569. The cubic root of 1921228 is about 124.3157923793.

The spelling of 1921228 in words is "one million, nine hundred twenty-one thousand, two hundred twenty-eight".