18240158 has 4 divisors (see below), whose sum is σ = 27360240. Its totient is φ = 9120078.

The previous prime is 18240151. The next prime is 18240161. The reversal of 18240158 is 85104281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85104281 = 131 ⋅649651.

It is a self number, because there is not a number n which added to its sum of digits gives 18240158.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18240151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4560038 + ... + 4560041.

It is an arithmetic number, because the mean of its divisors is an integer number (6840060).

Almost surely, 2^18240158 is an apocalyptic number.

18240158 is a deficient number, since it is larger than the sum of its proper divisors (9120082).

18240158 is an equidigital number, since it uses as much as digits as its factorization.

18240158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9120081.

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 18240158 is about 4270.8497983422. The cubic root of 18240158 is about 263.2345346757.

The spelling of 18240158 in words is "eighteen million, two hundred forty thousand, one hundred fifty-eight".