18039958 has 36 divisors (see below), whose sum is σ = 30558780. Its totient is φ = 7982656.

The previous prime is 18039953. The next prime is 18039961. The reversal of 18039958 is 85993081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18039953) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 305733 + ... + 305791.

It is an arithmetic number, because the mean of its divisors is an integer number (848855).

Almost surely, 2^18039958 is an apocalyptic number.

18039958 is a deficient number, since it is larger than the sum of its proper divisors (12518822).

18039958 is a wasteful number, since it uses less digits than its factorization.

18039958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 18039958 is about 4247.3471720593. The cubic root of 18039958 is about 262.2679212569.

The spelling of 18039958 in words is "eighteen million, thirty-nine thousand, nine hundred fifty-eight".