1928281 has 4 divisors (see below), whose sum is σ = 1937152. Its totient is φ = 1919412.

The previous prime is 1928261. The next prime is 1928287. The reversal of 1928281 is 1828291.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1928281 - 2¹³ = 1920089 is a prime.

It is a super-2 number, since 2×1928281² = 7436535229922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1928287) 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, 4101 + ... + 4546.

It is an arithmetic number, because the mean of its divisors is an integer number (484288).

2^1928281 is an apocalyptic number.

It is an amenable number.

1928281 is a deficient number, since it is larger than the sum of its proper divisors (8871).

1928281 is an equidigital number, since it uses as much as digits as its factorization.

1928281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8870.

The product of its digits is 2304, while the sum is 31.

The square root of 1928281 is about 1388.6255794850. The cubic root of 1928281 is about 124.4677314048.

It can be divided in two parts, 1928 and 281, that added together give a square (2209 = 47²).

The spelling of 1928281 in words is "one million, nine hundred twenty-eight thousand, two hundred eighty-one".