1930221 has 6 divisors (see below), whose sum is σ = 2788110. Its totient is φ = 1286808.

The previous prime is 1930219. The next prime is 1930237. The reversal of 1930221 is 1220391.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1929321 + 900 = 1389^2 + 30^2 .

It is not a de Polignac number, because 1930221 - 2¹ = 1930219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1930194 and 1930203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1930261) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 107226 + ... + 107243.

It is an arithmetic number, because the mean of its divisors is an integer number (464685).

2^1930221 is an apocalyptic number.

It is an amenable number.

1930221 is a deficient number, since it is larger than the sum of its proper divisors (857889).

1930221 is a wasteful number, since it uses less digits than its factorization.

1930221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214475 (or 214472 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 1930221 is about 1389.3239363086. The cubic root of 1930221 is about 124.5094588062.

The spelling of 1930221 in words is "one million, nine hundred thirty thousand, two hundred twenty-one".