1680442 has 8 divisors (see below), whose sum is σ = 2539476. Its totient is φ = 833952.

The previous prime is 1680439. The next prime is 1680457. The reversal of 1680442 is 2440861.

It can be written as a sum of positive squares in 2 ways, for example, as 1485961 + 194481 = 1219^2 + 441^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2793 + ... + 3340.

2^1680442 is an apocalyptic number.

1680442 is a deficient number, since it is larger than the sum of its proper divisors (859034).

1680442 is a wasteful number, since it uses less digits than its factorization.

1680442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6272.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 1680442 is about 1296.3186336700. The cubic root of 1680442 is about 118.8888635915. Note that the first 4 decimals are identical.

The spelling of 1680442 in words is "one million, six hundred eighty thousand, four hundred forty-two".