18490971 has 8 divisors (see below), whose sum is σ = 25952320. Its totient is φ = 11678472.

The previous prime is 18490961. The next prime is 18490987. The reversal of 18490971 is 17909481.

It is a happy number.

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

It is not a de Polignac number, because 18490971 - 2⁵ = 18490939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18490921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162145 + ... + 162258.

It is an arithmetic number, because the mean of its divisors is an integer number (3244040).

Almost surely, 2^18490971 is an apocalyptic number.

18490971 is a deficient number, since it is larger than the sum of its proper divisors (7461349).

18490971 is a wasteful number, since it uses less digits than its factorization.

18490971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324425.

The product of its (nonzero) digits is 18144, while the sum is 39.

The square root of 18490971 is about 4300.1129054945. The cubic root of 18490971 is about 264.4355900115.

The spelling of 18490971 in words is "eighteen million, four hundred ninety thousand, nine hundred seventy-one".