18197542 has 8 divisors (see below), whose sum is σ = 29777832. Its totient is φ = 8271600.

The previous prime is 18197453. The next prime is 18197549. The reversal of 18197542 is 24579181.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18197549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 413559 + ... + 413602.

It is an arithmetic number, because the mean of its divisors is an integer number (3722229).

Almost surely, 2^18197542 is an apocalyptic number.

18197542 is a deficient number, since it is larger than the sum of its proper divisors (11580290).

18197542 is a wasteful number, since it uses less digits than its factorization.

18197542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827174.

The product of its digits is 20160, while the sum is 37.

The square root of 18197542 is about 4265.8577097695. The cubic root of 18197542 is about 263.0293692233.

The spelling of 18197542 in words is "eighteen million, one hundred ninety-seven thousand, five hundred forty-two".