1680413 has 4 divisors (see below), whose sum is σ = 1920480. Its totient is φ = 1440348.

The previous prime is 1680407. The next prime is 1680421. The reversal of 1680413 is 3140861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-1680413 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 1 + 6⁸ + 8³ + 0 + 4⁴ + 1 + 3³ .

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680013) 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, 120023 + ... + 120036.

It is an arithmetic number, because the mean of its divisors is an integer number (480120).

2^1680413 is an apocalyptic number.

It is an amenable number.

1680413 is a deficient number, since it is larger than the sum of its proper divisors (240067).

1680413 is an equidigital number, since it uses as much as digits as its factorization.

1680413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240066.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 1680413 is about 1296.3074481002. The cubic root of 1680413 is about 118.8881796848. Note that the first 3 decimals are identical.

The spelling of 1680413 in words is "one million, six hundred eighty thousand, four hundred thirteen".