18797436 has 72 divisors (see below), whose sum is σ = 54934880. Its totient is φ = 5308416.

The previous prime is 18797431. The next prime is 18797447. The reversal of 18797436 is 63479781.

It is a junction number, because it is equal to n+sod(n) for n = 18797391 and 18797400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18797431) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24060 + ... + 24828.

Almost surely, 2^18797436 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18797436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27467440).

18797436 is an abundant number, since it is smaller than the sum of its proper divisors (36137444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18797436 is a wasteful number, since it uses less digits than its factorization.

18797436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883 (or 878 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 18797436 is about 4335.6009964018. The cubic root of 18797436 is about 265.8884903930. Note that the first 3 decimals are identical.

The spelling of 18797436 in words is "eighteen million, seven hundred ninety-seven thousand, four hundred thirty-six".