18061438 has 8 divisors (see below), whose sum is σ = 28518120. Its totient is φ = 8555400.

The previous prime is 18061427. The next prime is 18061453. The reversal of 18061438 is 83416081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 237613 + ... + 237688.

It is an arithmetic number, because the mean of its divisors is an integer number (3564765).

Almost surely, 2^18061438 is an apocalyptic number.

18061438 is a deficient number, since it is larger than the sum of its proper divisors (10456682).

18061438 is a wasteful number, since it uses less digits than its factorization.

18061438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475322.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 18061438 is about 4249.8750569870. The cubic root of 18061438 is about 262.3719732453.

The spelling of 18061438 in words is "eighteen million, sixty-one thousand, four hundred thirty-eight".