18109497 has 32 divisors (see below), whose sum is σ = 28601344. Its totient is φ = 9979200.

The previous prime is 18109457. The next prime is 18109499. The reversal of 18109497 is 79490181.

It is a happy number.

It is not a de Polignac number, because 18109497 - 2¹² = 18105401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18109499) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85722 + ... + 85932.

It is an arithmetic number, because the mean of its divisors is an integer number (893792).

Almost surely, 2^18109497 is an apocalyptic number.

It is an amenable number.

18109497 is a deficient number, since it is larger than the sum of its proper divisors (10491847).

18109497 is a wasteful number, since it uses less digits than its factorization.

18109497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349.

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

The square root of 18109497 is about 4255.5254669664. The cubic root of 18109497 is about 262.6044790451.

The spelling of 18109497 in words is "eighteen million, one hundred nine thousand, four hundred ninety-seven".