18740505 has 16 divisors (see below), whose sum is σ = 34268544. Its totient is φ = 8567040.

The previous prime is 18740489. The next prime is 18740531. The reversal of 18740505 is 50504781.

It is not a de Polignac number, because 18740505 - 2⁴ = 18740489 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89136 + ... + 89345.

It is an arithmetic number, because the mean of its divisors is an integer number (2141784).

Almost surely, 2^18740505 is an apocalyptic number.

18740505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18740505 is a deficient number, since it is larger than the sum of its proper divisors (15528039).

18740505 is a wasteful number, since it uses less digits than its factorization.

18740505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178496.

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 18740505 is about 4329.0304919231. The cubic root of 18740505 is about 265.6197905322.

The spelling of 18740505 in words is "eighteen million, seven hundred forty thousand, five hundred five".