18396437 has 8 divisors (see below), whose sum is σ = 18954552. Its totient is φ = 17841600.

The previous prime is 18396409. The next prime is 18396439. The reversal of 18396437 is 73469381.

It can be written as a sum of positive squares in 4 ways, for example, as 4363921 + 14032516 = 2089^2 + 3746^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18396437 - 2¹⁴ = 18380053 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18396394 and 18396403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18396439) 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 7 ways as a sum of consecutive naturals, for example, 14987 + ... + 16167.

It is an arithmetic number, because the mean of its divisors is an integer number (2369319).

Almost surely, 2^18396437 is an apocalyptic number.

It is an amenable number.

18396437 is a deficient number, since it is larger than the sum of its proper divisors (558115).

18396437 is a wasteful number, since it uses less digits than its factorization.

18396437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1639.

The product of its digits is 108864, while the sum is 41.

The square root of 18396437 is about 4289.1067834690. The cubic root of 18396437 is about 263.9841827453.

The spelling of 18396437 in words is "eighteen million, three hundred ninety-six thousand, four hundred thirty-seven".