18240747 has 16 divisors (see below), whose sum is σ = 28388352. Its totient is φ = 10200960.

The previous prime is 18240743. The next prime is 18240751. The reversal of 18240747 is 74704281.

It is an interprime number because it is at equal distance from previous prime (18240743) and next prime (18240751).

It is not a de Polignac number, because 18240747 - 2² = 18240743 is a prime.

It is a super-2 number, since 2×18240747² = 665449702236018, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18240743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8254 + ... + 10227.

It is an arithmetic number, because the mean of its divisors is an integer number (1774272).

Almost surely, 2^18240747 is an apocalyptic number.

18240747 is a deficient number, since it is larger than the sum of its proper divisors (10147605).

18240747 is a wasteful number, since it uses less digits than its factorization.

18240747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18538.

The product of its (nonzero) digits is 12544, while the sum is 33.

The square root of 18240747 is about 4270.9187536173. The cubic root of 18240747 is about 263.2373680480.

The spelling of 18240747 in words is "eighteen million, two hundred forty thousand, seven hundred forty-seven".