18405074 has 4 divisors (see below), whose sum is σ = 27607614. Its totient is φ = 9202536.

The previous prime is 18405061. The next prime is 18405089. The reversal of 18405074 is 47050481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 47050481 = 2029 ⋅23189.

It can be written as a sum of positive squares in only one way, i.e., 16345849 + 2059225 = 4043^2 + 1435^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4601267 + ... + 4601270.

Almost surely, 2^18405074 is an apocalyptic number.

18405074 is a deficient number, since it is larger than the sum of its proper divisors (9202540).

18405074 is an equidigital number, since it uses as much as digits as its factorization.

18405074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9202539.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 18405074 is about 4290.1135183116. The cubic root of 18405074 is about 264.0254891980.

The spelling of 18405074 in words is "eighteen million, four hundred five thousand, seventy-four".