18071542 has 4 divisors (see below), whose sum is σ = 27107316. Its totient is φ = 9035770.

The previous prime is 18071509. The next prime is 18071549. The reversal of 18071542 is 24517081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24517081 = 71 ⋅345311.

It is a self number, because there is not a number n which added to its sum of digits gives 18071542.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18071549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4517884 + ... + 4517887.

It is an arithmetic number, because the mean of its divisors is an integer number (6776829).

Almost surely, 2^18071542 is an apocalyptic number.

18071542 is a deficient number, since it is larger than the sum of its proper divisors (9035774).

18071542 is an equidigital number, since it uses as much as digits as its factorization.

18071542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9035773.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 18071542 is about 4251.0636316103. The cubic root of 18071542 is about 262.4208898418.

The spelling of 18071542 in words is "eighteen million, seventy-one thousand, five hundred forty-two".