1813623 has 16 divisors (see below), whose sum is σ = 2807040. Its totient is φ = 1020096.

The previous prime is 1813613. The next prime is 1813627. The reversal of 1813623 is 3263181.

It is not a de Polignac number, because 1813623 - 2⁸ = 1813367 is a prime.

It is a super-2 number, since 2×1813623² = 6578456772258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1813593 and 1813602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 763 + ... + 2051.

It is an arithmetic number, because the mean of its divisors is an integer number (175440).

2^1813623 is an apocalyptic number.

1813623 is a deficient number, since it is larger than the sum of its proper divisors (993417).

1813623 is a wasteful number, since it uses less digits than its factorization.

1813623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366.

The product of its digits is 864, while the sum is 24.

The square root of 1813623 is about 1346.7082089302. The cubic root of 1813623 is about 121.9501498387.

The spelling of 1813623 in words is "one million, eight hundred thirteen thousand, six hundred twenty-three".