1928609 has 4 divisors (see below), whose sum is σ = 1932420. Its totient is φ = 1924800.

The previous prime is 1928569. The next prime is 1928621. The reversal of 1928609 is 9068291.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9068291 = 383 ⋅23677.

It can be written as a sum of positive squares in 2 ways, for example, as 1373584 + 555025 = 1172^2 + 745^2 .

It is a cyclic number.

It is not a de Polignac number, because 1928609 - 2¹² = 1924513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1928629) 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, 1004 + ... + 2205.

It is an arithmetic number, because the mean of its divisors is an integer number (483105).

2^1928609 is an apocalyptic number.

It is an amenable number.

1928609 is a deficient number, since it is larger than the sum of its proper divisors (3811).

1928609 is an equidigital number, since it uses as much as digits as its factorization.

1928609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3810.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 1928609 is about 1388.7436768533. The cubic root of 1928609 is about 124.4747883122.

The spelling of 1928609 in words is "one million, nine hundred twenty-eight thousand, six hundred nine".