18955480 has 16 divisors (see below), whose sum is σ = 42649920. Its totient is φ = 7582176.

The previous prime is 18955471. The next prime is 18955481. The reversal of 18955480 is 8455981.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 473887 = 18955480 / (1 + 8 + 9 + 5 + 5 + 4 + 8 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18955481) 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 3 ways as a sum of consecutive naturals, for example, 236904 + ... + 236983.

It is an arithmetic number, because the mean of its divisors is an integer number (2665620).

Almost surely, 2^18955480 is an apocalyptic number.

18955480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18955480 is an abundant number, since it is smaller than the sum of its proper divisors (23694440).

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

18955480 is a wasteful number, since it uses less digits than its factorization.

18955480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473898 (or 473894 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 40.

The square root of 18955480 is about 4353.7891542885. The cubic root of 18955480 is about 266.6315856629.

The spelling of 18955480 in words is "eighteen million, nine hundred fifty-five thousand, four hundred eighty".