18971814 has 16 divisors (see below), whose sum is σ = 39168000. Its totient is φ = 6119880.

The previous prime is 18971809. The next prime is 18971831. The reversal of 18971814 is 41817981.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50814 + ... + 51185.

It is an arithmetic number, because the mean of its divisors is an integer number (2448000).

Almost surely, 2^18971814 is an apocalyptic number.

18971814 is an abundant number, since it is smaller than the sum of its proper divisors (20196186).

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

18971814 is a wasteful number, since it uses less digits than its factorization.

18971814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102035.

The product of its digits is 16128, while the sum is 39.

The square root of 18971814 is about 4355.6645876376. The cubic root of 18971814 is about 266.7081494494.

The spelling of 18971814 in words is "eighteen million, nine hundred seventy-one thousand, eight hundred fourteen".