1980669 has 8 divisors (see below), whose sum is σ = 2705472. Its totient is φ = 1288160.

The previous prime is 1980661. The next prime is 1980673. The reversal of 1980669 is 9660891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1980669 - 2³ = 1980661 is a prime.

It is a super-2 number, since 2×1980669² = 7846099375122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7929 + ... + 8174.

It is an arithmetic number, because the mean of its divisors is an integer number (338184).

2^1980669 is an apocalyptic number.

It is an amenable number.

1980669 is a deficient number, since it is larger than the sum of its proper divisors (724803).

1980669 is a wasteful number, since it uses less digits than its factorization.

1980669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16147.

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 1980669 is about 1407.3624266691. The cubic root of 1980669 is about 125.5848645332.

The spelling of 1980669 in words is "one million, nine hundred eighty thousand, six hundred sixty-nine".