18477948 has 24 divisors (see below), whose sum is σ = 44281552. Its totient is φ = 5992704.

The previous prime is 18477887. The next prime is 18477961. The reversal of 18477948 is 84977481.

It is a junction number, because it is equal to n+sod(n) for n = 18477897 and 18477906.

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, 20365 + ... + 21252.

Almost surely, 2^18477948 is an apocalyptic number.

It is an amenable number.

18477948 is an abundant number, since it is smaller than the sum of its proper divisors (25803604).

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

18477948 is a wasteful number, since it uses less digits than its factorization.

18477948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41661 (or 41659 counting only the distinct ones).

The product of its digits is 451584, while the sum is 48.

The square root of 18477948 is about 4298.5983762152. The cubic root of 18477948 is about 264.3734956797.

The spelling of 18477948 in words is "eighteen million, four hundred seventy-seven thousand, nine hundred forty-eight".