18478232 has 16 divisors (see below), whose sum is σ = 35764800. Its totient is φ = 8940960.

The previous prime is 18478231. The next prime is 18478237. The reversal of 18478232 is 23287481.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 18478192 and 18478201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18478231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37007 + ... + 37502.

It is an arithmetic number, because the mean of its divisors is an integer number (2235300).

Almost surely, 2^18478232 is an apocalyptic number.

It is an amenable number.

18478232 is a deficient number, since it is larger than the sum of its proper divisors (17286568).

18478232 is a wasteful number, since it uses less digits than its factorization.

18478232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74546 (or 74542 counting only the distinct ones).

The product of its digits is 21504, while the sum is 35.

The square root of 18478232 is about 4298.6314101118. The cubic root of 18478232 is about 264.3748501174.

Subtracting 18478232 from its reverse (23287481), we obtain a square (4809249 = 2193²).

The spelling of 18478232 in words is "eighteen million, four hundred seventy-eight thousand, two hundred thirty-two".