18955440 has 120 divisors (see below), whose sum is σ = 72772128. Its totient is φ = 4331520.

The previous prime is 18955403. The next prime is 18955451. The reversal of 18955440 is 4455981.

It is a tau number, because it is divible by the number of its divisors (120).

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 = 18955395 and 18955404.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3160 + ... + 6920.

Almost surely, 2^18955440 is an apocalyptic number.

18955440 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 18955440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36386064).

18955440 is an abundant number, since it is smaller than the sum of its proper divisors (53816688).

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

18955440 is a wasteful number, since it uses less digits than its factorization.

18955440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3787 (or 3778 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 18955440 is about 4353.7845605863. The cubic root of 18955440 is about 266.6313981135.

The spelling of 18955440 in words is "eighteen million, nine hundred fifty-five thousand, four hundred forty".