18440958 has 8 divisors (see below), whose sum is σ = 36881928. Its totient is φ = 6146984.

The previous prime is 18440953. The next prime is 18440959. The reversal of 18440958 is 85904481.

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

18440958 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18440951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1536741 + ... + 1536752.

It is an arithmetic number, because the mean of its divisors is an integer number (4610241).

Almost surely, 2^18440958 is an apocalyptic number.

18440958 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18440958 is a wasteful number, since it uses less digits than its factorization.

18440958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3073498.

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 18440958 is about 4294.2936555387. The cubic root of 18440958 is about 264.1969661874.

The spelling of 18440958 in words is "eighteen million, four hundred forty thousand, nine hundred fifty-eight".