1681618 has 8 divisors (see below), whose sum is σ = 2565360. Its totient is φ = 826500.

The previous prime is 1681597. The next prime is 1681619. The reversal of 1681618 is 8161861.

It is a happy number.

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

It is an Ulam number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 1681618.

It is not an unprimeable number, because it can be changed into a prime (1681619) 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, 7008 + ... + 7243.

It is an arithmetic number, because the mean of its divisors is an integer number (320670).

2^1681618 is an apocalyptic number.

1681618 is a deficient number, since it is larger than the sum of its proper divisors (883742).

1681618 is a wasteful number, since it uses less digits than its factorization.

1681618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14312.

The product of its digits is 2304, while the sum is 31.

The square root of 1681618 is about 1296.7721465238. The cubic root of 1681618 is about 118.9165905629.

The spelling of 1681618 in words is "one million, six hundred eighty-one thousand, six hundred eighteen".