1813688 has 16 divisors (see below), whose sum is σ = 3548880. Its totient is φ = 867328.

The previous prime is 1813681. The next prime is 1813699. The reversal of 1813688 is 8863181.

It is a happy number.

It is a super-2 number, since 2×1813688² = 6578928322688, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813681) 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, 4745 + ... + 5112.

It is an arithmetic number, because the mean of its divisors is an integer number (221805).

2^1813688 is an apocalyptic number.

It is an amenable number.

1813688 is a deficient number, since it is larger than the sum of its proper divisors (1735192).

1813688 is a wasteful number, since it uses less digits than its factorization.

1813688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9886 (or 9882 counting only the distinct ones).

The product of its digits is 9216, while the sum is 35.

The square root of 1813688 is about 1346.7323416329. The cubic root of 1813688 is about 121.9516067136.

The spelling of 1813688 in words is "one million, eight hundred thirteen thousand, six hundred eighty-eight".