1687242 has 8 divisors (see below), whose sum is σ = 3374496. Its totient is φ = 562412.

The previous prime is 1687193. The next prime is 1687247. The reversal of 1687242 is 2427861.

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

1687242 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (1687247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140598 + ... + 140609.

It is an arithmetic number, because the mean of its divisors is an integer number (421812).

2^1687242 is an apocalyptic number.

1687242 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1687242 is a wasteful number, since it uses less digits than its factorization.

1687242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281212.

The product of its digits is 5376, while the sum is 30.

The square root of 1687242 is about 1298.9387976344. The cubic root of 1687242 is about 119.0490111888.

The spelling of 1687242 in words is "one million, six hundred eighty-seven thousand, two hundred forty-two".