18965340 has 120 divisors (see below), whose sum is σ = 62203680. Its totient is φ = 4828032.

The previous prime is 18965281. The next prime is 18965341. The reversal of 18965340 is 4356981.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18965295 and 18965304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18965341) 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 39 ways as a sum of consecutive naturals, for example, 37006 + ... + 37514.

It is an arithmetic number, because the mean of its divisors is an integer number (518364).

Almost surely, 2^18965340 is an apocalyptic number.

18965340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18965340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31101840).

18965340 is an abundant number, since it is smaller than the sum of its proper divisors (43238340).

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

18965340 is a wasteful number, since it uses less digits than its factorization.

18965340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553 (or 542 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 18965340 is about 4354.9213540545. The cubic root of 18965340 is about 266.6778085622.

The spelling of 18965340 in words is "eighteen million, nine hundred sixty-five thousand, three hundred forty".