18473138 has 16 divisors (see below), whose sum is σ = 28629504. Its totient is φ = 8933040.

The previous prime is 18473093. The next prime is 18473141. The reversal of 18473138 is 83137481.

It is a super-4 number, since 4×18473138⁴ (a number of 30 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18473098 and 18473107.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13481 + ... + 14787.

It is an arithmetic number, because the mean of its divisors is an integer number (1789344).

Almost surely, 2^18473138 is an apocalyptic number.

18473138 is a deficient number, since it is larger than the sum of its proper divisors (10156366).

18473138 is a wasteful number, since it uses less digits than its factorization.

18473138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1537.

The product of its digits is 16128, while the sum is 35.

The square root of 18473138 is about 4298.0388551059. The cubic root of 18473138 is about 264.3505539751.

The spelling of 18473138 in words is "eighteen million, four hundred seventy-three thousand, one hundred thirty-eight".