18949128 has 32 divisors (see below), whose sum is σ = 51680160. Its totient is φ = 5742080.

The previous prime is 18949123. The next prime is 18949129. The reversal of 18949128 is 82194981.

It is a self number, because there is not a number n which added to its sum of digits gives 18949128.

It is not an unprimeable number, because it can be changed into a prime (18949123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35625 + ... + 36152.

It is an arithmetic number, because the mean of its divisors is an integer number (1615005).

Almost surely, 2^18949128 is an apocalyptic number.

It is an amenable number.

18949128 is an abundant number, since it is smaller than the sum of its proper divisors (32731032).

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

18949128 is a wasteful number, since it uses less digits than its factorization.

18949128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71797 (or 71793 counting only the distinct ones).

The product of its digits is 41472, while the sum is 42.

The square root of 18949128 is about 4353.0596136511. The cubic root of 18949128 is about 266.6017995000.

The spelling of 18949128 in words is "eighteen million, nine hundred forty-nine thousand, one hundred twenty-eight".