1980406 has 8 divisors (see below), whose sum is σ = 2976984. Its totient is φ = 988080.

The previous prime is 1980401. The next prime is 1980409. The reversal of 1980406 is 6040891.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980401) 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, 666 + ... + 2098.

It is an arithmetic number, because the mean of its divisors is an integer number (372123).

2^1980406 is an apocalyptic number.

1980406 is a deficient number, since it is larger than the sum of its proper divisors (996578).

1980406 is a wasteful number, since it uses less digits than its factorization.

1980406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2126.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 1980406 is about 1407.2689863704. The cubic root of 1980406 is about 125.5793057579.

The spelling of 1980406 in words is "one million, nine hundred eighty thousand, four hundred six".