1980569 has 4 divisors (see below), whose sum is σ = 1983696. Its totient is φ = 1977444.

The previous prime is 1980529. The next prime is 1980577. The reversal of 1980569 is 9650891.

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 a de Polignac number, because none of the positive numbers 2^k-1980569 is a prime.

It is a super-2 number, since 2×1980569² = 7845307127522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1980529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239 + ... + 2004.

It is an arithmetic number, because the mean of its divisors is an integer number (495924).

2^1980569 is an apocalyptic number.

It is an amenable number.

1980569 is a deficient number, since it is larger than the sum of its proper divisors (3127).

1980569 is an equidigital number, since it uses as much as digits as its factorization.

1980569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3126.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 1980569 is about 1407.3268987694. The cubic root of 1980569 is about 125.5827509884.

The spelling of 1980569 in words is "one million, nine hundred eighty thousand, five hundred sixty-nine".