18985461 has 8 divisors (see below), whose sum is σ = 27615264. Its totient is φ = 11506320.

The previous prime is 18985451. The next prime is 18985513. The reversal of 18985461 is 16458981.

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

It is not a de Polignac number, because 18985461 - 2⁵ = 18985429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18985441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 287626 + ... + 287691.

It is an arithmetic number, because the mean of its divisors is an integer number (3451908).

Almost surely, 2^18985461 is an apocalyptic number.

18985461 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18985461 is a deficient number, since it is larger than the sum of its proper divisors (8629803).

18985461 is a wasteful number, since it uses less digits than its factorization.

18985461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 575331.

The product of its digits is 69120, while the sum is 42.

The square root of 18985461 is about 4357.2308866986. The cubic root of 18985461 is about 266.7720845363.

The spelling of 18985461 in words is "eighteen million, nine hundred eighty-five thousand, four hundred sixty-one".