18918141 has 8 divisors (see below), whose sum is σ = 27517344. Its totient is φ = 11465520.

The previous prime is 18918139. The next prime is 18918143. The reversal of 18918141 is 14181981.

It is an interprime number because it is at equal distance from previous prime (18918139) and next prime (18918143).

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

It is not a de Polignac number, because 18918141 - 2¹ = 18918139 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 573277 = 18918141 / (1 + 8 + 9 + 1 + 8 + 1 + 4 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18918143) 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, 286606 + ... + 286671.

It is an arithmetic number, because the mean of its divisors is an integer number (3439668).

Almost surely, 2^18918141 is an apocalyptic number.

18918141 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18918141 is a deficient number, since it is larger than the sum of its proper divisors (8599203).

18918141 is a wasteful number, since it uses less digits than its factorization.

18918141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573291.

The product of its digits is 2304, while the sum is 33.

The square root of 18918141 is about 4349.4989366593. The cubic root of 18918141 is about 266.4563979604.

The spelling of 18918141 in words is "eighteen million, nine hundred eighteen thousand, one hundred forty-one".