18971142 has 8 divisors (see below), whose sum is σ = 37942296. Its totient is φ = 6323712.

The previous prime is 18971131. The next prime is 18971143. The reversal of 18971142 is 24117981.

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

18971142 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18971143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1580923 + ... + 1580934.

It is an arithmetic number, because the mean of its divisors is an integer number (4742787).

Almost surely, 2^18971142 is an apocalyptic number.

18971142 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18971142 is a wasteful number, since it uses less digits than its factorization.

18971142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3161862.

The product of its digits is 4032, while the sum is 33.

The square root of 18971142 is about 4355.5874460284. The cubic root of 18971142 is about 266.7050003920.

The spelling of 18971142 in words is "eighteen million, nine hundred seventy-one thousand, one hundred forty-two".