18984705 has 32 divisors (see below), whose sum is σ = 33091200. Its totient is φ = 9257472.

The previous prime is 18984703. The next prime is 18984709. The reversal of 18984705 is 50748981.

It is not a de Polignac number, because 18984705 - 2¹ = 18984703 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18984701) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7117 + ... + 9413.

It is an arithmetic number, because the mean of its divisors is an integer number (1034100).

Almost surely, 2^18984705 is an apocalyptic number.

18984705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18984705 is a deficient number, since it is larger than the sum of its proper divisors (14106495).

18984705 is a wasteful number, since it uses less digits than its factorization.

18984705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2353.

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 18984705 is about 4357.1441334893. The cubic root of 18984705 is about 266.7685435395.

The spelling of 18984705 in words is "eighteen million, nine hundred eighty-four thousand, seven hundred five".