1928921 has 6 divisors (see below), whose sum is σ = 1983870. Its totient is φ = 1875456.

The previous prime is 1928873. The next prime is 1928929. The reversal of 1928921 is 1298291.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 462400 + 1466521 = 680^2 + 1211^2 .

It is not a de Polignac number, because 1928921 - 2¹⁰ = 1927897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1928929) 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, 665 + ... + 2073.

It is an arithmetic number, because the mean of its divisors is an integer number (330645).

2^1928921 is an apocalyptic number.

It is an amenable number.

1928921 is a deficient number, since it is larger than the sum of its proper divisors (54949).

1928921 is an equidigital number, since it uses as much as digits as its factorization.

1928921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1483 (or 1446 counting only the distinct ones).

The product of its digits is 2592, while the sum is 32.

The square root of 1928921 is about 1388.8560040551. The cubic root of 1928921 is about 124.4815002377.

The spelling of 1928921 in words is "one million, nine hundred twenty-eight thousand, nine hundred twenty-one".