18965440 has 112 divisors (see below), whose sum is σ = 50182272. Its totient is φ = 6782976.

The previous prime is 18965407. The next prime is 18965447. The reversal of 18965440 is 4456981.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18965440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18965447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195472 + ... + 195568.

It is an arithmetic number, because the mean of its divisors is an integer number (448056).

Almost surely, 2^18965440 is an apocalyptic number.

18965440 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 18965440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25091136).

18965440 is an abundant number, since it is smaller than the sum of its proper divisors (31216832).

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

18965440 is a wasteful number, since it uses less digits than its factorization.

18965440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174 (or 164 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 18965440 is about 4354.9328353030. The cubic root of 18965440 is about 266.6782772722.

The spelling of 18965440 in words is "eighteen million, nine hundred sixty-five thousand, four hundred forty".