1928569 has 2 divisors, whose sum is σ = 1928570. Its totient is φ = 1928568.

The previous prime is 1928567. The next prime is 1928621. The reversal of 1928569 is 9658291.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1926544 + 2025 = 1388^2 + 45^2 .

It is an emirp because it is prime and its reverse (9658291) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1928569 - 2¹ = 1928567 is a prime.

It is a super-2 number, since 2×1928569² = 7438756775522, which contains 22 as substring.

Together with 1928567, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1928561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 964284 + 964285.

It is an arithmetic number, because the mean of its divisors is an integer number (964285).

2^1928569 is an apocalyptic number.

It is an amenable number.

1928569 is a deficient number, since it is larger than the sum of its proper divisors (1).

1928569 is an equidigital number, since it uses as much as digits as its factorization.

1928569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 40.

The square root of 1928569 is about 1388.7292752729. The cubic root of 1928569 is about 124.4739277566.

The spelling of 1928569 in words is "one million, nine hundred twenty-eight thousand, five hundred sixty-nine".