18479640 has 32 divisors (see below), whose sum is σ = 55439280. Its totient is φ = 4927872.

The previous prime is 18479611. The next prime is 18479651. The reversal of 18479640 is 4697481.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76879 + ... + 77118.

Almost surely, 2^18479640 is an apocalyptic number.

18479640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18479640 is an abundant number, since it is smaller than the sum of its proper divisors (36959640).

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

18479640 is a wasteful number, since it uses less digits than its factorization.

18479640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154011 (or 154007 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 18479640 is about 4298.7951800475. The cubic root of 18479640 is about 264.3815648712.

The spelling of 18479640 in words is "eighteen million, four hundred seventy-nine thousand, six hundred forty".