18471872 has 28 divisors (see below), whose sum is σ = 36804600. Its totient is φ = 9198336.

The previous prime is 18471863. The next prime is 18471881. The reversal of 18471872 is 27817481.

It is an interprime number because it is at equal distance from previous prime (18471863) and next prime (18471881).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21923 + ... + 22749.

It is an arithmetic number, because the mean of its divisors is an integer number (1314450).

Almost surely, 2^18471872 is an apocalyptic number.

It is an amenable number.

18471872 is a deficient number, since it is larger than the sum of its proper divisors (18332728).

18471872 is an equidigital number, since it uses as much as digits as its factorization.

18471872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1188 (or 1178 counting only the distinct ones).

The product of its digits is 25088, while the sum is 38.

The square root of 18471872 is about 4297.8915761103. The cubic root of 18471872 is about 264.3445150183.

The spelling of 18471872 in words is "eighteen million, four hundred seventy-one thousand, eight hundred seventy-two".