1980009 has 12 divisors (see below), whose sum is σ = 3010800. Its totient is φ = 1250424.

The previous prime is 1979993. The next prime is 1980019. The reversal of 1980009 is 9000891.

1980009 = T₄₄₇ + T₄₄₈ + ... + T₄₆₅.

It is not a de Polignac number, because 1980009 - 2⁴ = 1979993 is a prime.

1980009 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1980019) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5619 + ... + 5960.

It is an arithmetic number, because the mean of its divisors is an integer number (250900).

2^1980009 is an apocalyptic number.

1980009 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1980009 is a deficient number, since it is larger than the sum of its proper divisors (1030791).

1980009 is a wasteful number, since it uses less digits than its factorization.

1980009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11604 (or 11601 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 1980009 is about 1407.1279259541. The cubic root of 1980009 is about 125.5709138228.

The spelling of 1980009 in words is "one million, nine hundred eighty thousand, nine".