18994458 has 72 divisors (see below), whose sum is σ = 46999008. Its totient is φ = 5093088.

The previous prime is 18994453. The next prime is 18994463. The reversal of 18994458 is 85449981.

It is an interprime number because it is at equal distance from previous prime (18994453) and next prime (18994463).

It is a super-4 number, since 4×18994458⁴ (a number of 30 digits) contains 4444 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18994453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 358360 + ... + 358412.

It is an arithmetic number, because the mean of its divisors is an integer number (652764).

Almost surely, 2^18994458 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18994458, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23499504).

18994458 is an abundant number, since it is smaller than the sum of its proper divisors (28004550).

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

18994458 is a wasteful number, since it uses less digits than its factorization.

18994458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148 (or 88 counting only the distinct ones).

The product of its digits is 414720, while the sum is 48.

The square root of 18994458 is about 4358.2631861786. The cubic root of 18994458 is about 266.8142179950.

The spelling of 18994458 in words is "eighteen million, nine hundred ninety-four thousand, four hundred fifty-eight".