18040838 has 4 divisors (see below), whose sum is σ = 27061260. Its totient is φ = 9020418.

The previous prime is 18040831. The next prime is 18040879. The reversal of 18040838 is 83804081.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18040831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4510208 + ... + 4510211.

It is an arithmetic number, because the mean of its divisors is an integer number (6765315).

Almost surely, 2^18040838 is an apocalyptic number.

18040838 is a deficient number, since it is larger than the sum of its proper divisors (9020422).

18040838 is an equidigital number, since it uses as much as digits as its factorization.

18040838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9020421.

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 18040838 is about 4247.4507648706. The cubic root of 18040838 is about 262.2721857165.

The spelling of 18040838 in words is "eighteen million, forty thousand, eight hundred thirty-eight".