18488938 has 24 divisors (see below), whose sum is σ = 31622400. Its totient is φ = 8081424.

The previous prime is 18488933. The next prime is 18488971. The reversal of 18488938 is 83988481.

It is a junction number, because it is equal to n+sod(n) for n = 18488891 and 18488900.

It is not an unprimeable number, because it can be changed into a prime (18488933) 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, 4983 + ... + 7861.

It is an arithmetic number, because the mean of its divisors is an integer number (1317600).

Almost surely, 2^18488938 is an apocalyptic number.

18488938 is a deficient number, since it is larger than the sum of its proper divisors (13133462).

18488938 is a wasteful number, since it uses less digits than its factorization.

18488938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2926 (or 2913 counting only the distinct ones).

The product of its digits is 442368, while the sum is 49.

The square root of 18488938 is about 4299.8765098547. The cubic root of 18488938 is about 264.4258984841.

The spelling of 18488938 in words is "eighteen million, four hundred eighty-eight thousand, nine hundred thirty-eight".