18517042 has 4 divisors (see below), whose sum is σ = 27775566. Its totient is φ = 9258520.

The previous prime is 18517033. The next prime is 18517043. The reversal of 18517042 is 24071581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24071581 = 1597 ⋅15073.

It can be written as a sum of positive squares in only one way, i.e., 18224361 + 292681 = 4269^2 + 541^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18517042.

It is not an unprimeable number, because it can be changed into a prime (18517043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4629259 + ... + 4629262.

Almost surely, 2^18517042 is an apocalyptic number.

18517042 is a deficient number, since it is larger than the sum of its proper divisors (9258524).

18517042 is an equidigital number, since it uses as much as digits as its factorization.

18517042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9258523.

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

The square root of 18517042 is about 4303.1432697506. The cubic root of 18517042 is about 264.5598103267.

The spelling of 18517042 in words is "eighteen million, five hundred seventeen thousand, forty-two".