18343971 has 24 divisors (see below), whose sum is σ = 28106624. Its totient is φ = 11508480.

The previous prime is 18343943. The next prime is 18344017. The reversal of 18343971 is 17934381.

It is a happy number.

It is not a de Polignac number, because 18343971 - 2⁵ = 18343939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18343931) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9435 + ... + 11211.

Almost surely, 2^18343971 is an apocalyptic number.

18343971 is a deficient number, since it is larger than the sum of its proper divisors (9762653).

18343971 is a wasteful number, since it uses less digits than its factorization.

18343971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1851 (or 1848 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 18343971 is about 4282.9862245868. The cubic root of 18343971 is about 263.7329858824.

The spelling of 18343971 in words is "eighteen million, three hundred forty-three thousand, nine hundred seventy-one".