18971105 has 8 divisors (see below), whose sum is σ = 22790592. Its totient is φ = 15160048.

The previous prime is 18971089. The next prime is 18971107. The reversal of 18971105 is 50117981.

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 18971105 - 2⁴ = 18971089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18971107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5084 + ... + 7986.

It is an arithmetic number, because the mean of its divisors is an integer number (2848824).

Almost surely, 2^18971105 is an apocalyptic number.

It is an amenable number.

18971105 is a deficient number, since it is larger than the sum of its proper divisors (3819487).

18971105 is a wasteful number, since it uses less digits than its factorization.

18971105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4215.

The product of its (nonzero) digits is 2520, while the sum is 32.

The square root of 18971105 is about 4355.5831986084. The cubic root of 18971105 is about 266.7048270042.

The spelling of 18971105 in words is "eighteen million, nine hundred seventy-one thousand, one hundred five".