1980705 has 8 divisors (see below), whose sum is σ = 3169152. Its totient is φ = 1056368.

The previous prime is 1980703. The next prime is 1980707. The reversal of 1980705 is 5070891.

It is an interprime number because it is at equal distance from previous prime (1980703) and next prime (1980707).

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 1980705 - 2¹ = 1980703 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1980701) 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, 66009 + ... + 66038.

It is an arithmetic number, because the mean of its divisors is an integer number (396144).

2^1980705 is an apocalyptic number.

1980705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1980705 is a deficient number, since it is larger than the sum of its proper divisors (1188447).

1980705 is a wasteful number, since it uses less digits than its factorization.

1980705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132055.

The product of its (nonzero) digits is 2520, while the sum is 30.

The square root of 1980705 is about 1407.3752164935. The cubic root of 1980705 is about 125.5856253919.

The spelling of 1980705 in words is "one million, nine hundred eighty thousand, seven hundred five".