18213837 has 8 divisors (see below), whose sum is σ = 25563360. Its totient is φ = 11503440.

The previous prime is 18213829. The next prime is 18213857. The reversal of 18213837 is 73831281.

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

It is not a de Polignac number, because 18213837 - 2³ = 18213829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18213798 and 18213807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18213857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159714 + ... + 159827.

It is an arithmetic number, because the mean of its divisors is an integer number (3195420).

Almost surely, 2^18213837 is an apocalyptic number.

It is an amenable number.

18213837 is a deficient number, since it is larger than the sum of its proper divisors (7349523).

18213837 is a wasteful number, since it uses less digits than its factorization.

18213837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319563.

The product of its digits is 8064, while the sum is 33.

The square root of 18213837 is about 4267.7672148326. The cubic root of 18213837 is about 263.1078557370.

The spelling of 18213837 in words is "eighteen million, two hundred thirteen thousand, eight hundred thirty-seven".