18471138 has 24 divisors (see below), whose sum is σ = 42974352. Its totient is φ = 5277384.

The previous prime is 18471137. The next prime is 18471143. The reversal of 18471138 is 83117481.

It is a junction number, because it is equal to n+sod(n) for n = 18471099 and 18471108.

It is not an unprimeable number, because it can be changed into a prime (18471137) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31120 + ... + 31707.

It is an arithmetic number, because the mean of its divisors is an integer number (1790598).

Almost surely, 2^18471138 is an apocalyptic number.

18471138 is an abundant number, since it is smaller than the sum of its proper divisors (24503214).

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

18471138 is a wasteful number, since it uses less digits than its factorization.

18471138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62846 (or 62839 counting only the distinct ones).

The product of its digits is 5376, while the sum is 33.

The square root of 18471138 is about 4297.8061845551. The cubic root of 18471138 is about 264.3410136327.

The spelling of 18471138 in words is "eighteen million, four hundred seventy-one thousand, one hundred thirty-eight".