18994255 has 8 divisors (see below), whose sum is σ = 26049312. Its totient is φ = 13024608.

The previous prime is 18994201. The next prime is 18994273. The reversal of 18994255 is 55249981.

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

It is a cyclic number.

It is not a de Polignac number, because 18994255 - 2²¹ = 16897103 is a prime.

It is a super-3 number, since 3×18994255³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent 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, 271312 + ... + 271381.

It is an arithmetic number, because the mean of its divisors is an integer number (3256164).

Almost surely, 2^18994255 is an apocalyptic number.

18994255 is a deficient number, since it is larger than the sum of its proper divisors (7055057).

18994255 is an equidigital number, since it uses as much as digits as its factorization.

18994255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542705.

The product of its digits is 129600, while the sum is 43.

The square root of 18994255 is about 4358.2398970227. The cubic root of 18994255 is about 266.8132674813.

The spelling of 18994255 in words is "eighteen million, nine hundred ninety-four thousand, two hundred fifty-five".