18822413 has 4 divisors (see below), whose sum is σ = 18854748. Its totient is φ = 18790080.

The previous prime is 18822409. The next prime is 18822431. The reversal of 18822413 is 31422881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31422881 = 7 ⋅4488983.

It can be written as a sum of positive squares in 2 ways, for example, as 12482089 + 6340324 = 3533^2 + 2518^2 .

It is a cyclic number.

It is not a de Polignac number, because 18822413 - 2² = 18822409 is a prime.

It is a super-2 number, since 2×18822413² = 708566462285138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18822443) 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, 15278 + ... + 16463.

It is an arithmetic number, because the mean of its divisors is an integer number (4713687).

Almost surely, 2^18822413 is an apocalyptic number.

It is an amenable number.

18822413 is a deficient number, since it is larger than the sum of its proper divisors (32335).

18822413 is an equidigital number, since it uses as much as digits as its factorization.

18822413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32334.

The product of its digits is 3072, while the sum is 29.

The square root of 18822413 is about 4338.4804943667. The cubic root of 18822413 is about 266.0062042761.

The spelling of 18822413 in words is "eighteen million, eight hundred twenty-two thousand, four hundred thirteen".