1813697 has 4 divisors (see below), whose sum is σ = 1855920. Its totient is φ = 1771476.

The previous prime is 1813681. The next prime is 1813699. The reversal of 1813697 is 7963181.

1813697 = 184² + 185² + ... + 226².

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, and also an emirpimes, since its reverse is a distinct semiprime: 7963181 = 1433 ⋅5557.

It is a cyclic number.

It is not a de Polignac number, because 1813697 - 2⁴ = 1813681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1813699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21047 + ... + 21132.

It is an arithmetic number, because the mean of its divisors is an integer number (463980).

2^1813697 is an apocalyptic number.

It is an amenable number.

1813697 is a deficient number, since it is larger than the sum of its proper divisors (42223).

1813697 is an equidigital number, since it uses as much as digits as its factorization.

1813697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42222.

The product of its digits is 9072, while the sum is 35.

The square root of 1813697 is about 1346.7356830499. The cubic root of 1813697 is about 121.9518084320.

The spelling of 1813697 in words is "one million, eight hundred thirteen thousand, six hundred ninety-seven".