18971338 has 8 divisors (see below), whose sum is σ = 28645920. Its totient is φ = 9422700.

The previous prime is 18971317. The next prime is 18971347. The reversal of 18971338 is 83317981.

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

It is a self number, because there is not a number n which added to its sum of digits gives 18971338.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31108 + ... + 31711.

It is an arithmetic number, because the mean of its divisors is an integer number (3580740).

Almost surely, 2^18971338 is an apocalyptic number.

18971338 is a deficient number, since it is larger than the sum of its proper divisors (9674582).

18971338 is a wasteful number, since it uses less digits than its factorization.

18971338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62972.

The product of its digits is 36288, while the sum is 40.

The square root of 18971338 is about 4355.6099458055. The cubic root of 18971338 is about 266.7059188747.

The spelling of 18971338 in words is "eighteen million, nine hundred seventy-one thousand, three hundred thirty-eight".