18413971 has 4 divisors (see below), whose sum is σ = 18424744. Its totient is φ = 18403200.

The previous prime is 18413963. The next prime is 18413977. The reversal of 18413971 is 17931481.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18413971 - 2³ = 18413963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18413977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2190 + ... + 6451.

It is an arithmetic number, because the mean of its divisors is an integer number (4606186).

Almost surely, 2^18413971 is an apocalyptic number.

18413971 is a deficient number, since it is larger than the sum of its proper divisors (10773).

18413971 is an equidigital number, since it uses as much as digits as its factorization.

18413971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10772.

The product of its digits is 6048, while the sum is 34.

The square root of 18413971 is about 4291.1503119793. The cubic root of 18413971 is about 264.0680255908.

The spelling of 18413971 in words is "eighteen million, four hundred thirteen thousand, nine hundred seventy-one".