1980159 has 4 divisors (see below), whose sum is σ = 2640216. Its totient is φ = 1320104.

The previous prime is 1980113. The next prime is 1980169. The reversal of 1980159 is 9510891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1980159 - 2⁷ = 1980031 is a prime.

It is a D-number.

1980159 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980169) 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, 330024 + ... + 330029.

It is an arithmetic number, because the mean of its divisors is an integer number (660054).

2^1980159 is an apocalyptic number.

1980159 is a deficient number, since it is larger than the sum of its proper divisors (660057).

1980159 is an equidigital number, since it uses as much as digits as its factorization.

1980159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660056.

The product of its (nonzero) digits is 3240, while the sum is 33.

The square root of 1980159 is about 1407.1812250027. The cubic root of 1980159 is about 125.5740847110.

The spelling of 1980159 in words is "one million, nine hundred eighty thousand, one hundred fifty-nine".