18140738 has 16 divisors (see below), whose sum is σ = 33925824. Its totient is φ = 7067760.

The previous prime is 18140723. The next prime is 18140741. The reversal of 18140738 is 83704181.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58745 + ... + 59052.

It is an arithmetic number, because the mean of its divisors is an integer number (2120364).

Almost surely, 2^18140738 is an apocalyptic number.

18140738 is a deficient number, since it is larger than the sum of its proper divisors (15785086).

18140738 is a wasteful number, since it uses less digits than its factorization.

18140738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117817.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 18140738 is about 4259.1945247899. The cubic root of 18140738 is about 262.7554001044.

The spelling of 18140738 in words is "eighteen million, one hundred forty thousand, seven hundred thirty-eight".