18240553 has 8 divisors (see below), whose sum is σ = 18476640. Its totient is φ = 18006240.

The previous prime is 18240529. The next prime is 18240577. The reversal of 18240553 is 35504281.

It is an interprime number because it is at equal distance from previous prime (18240529) and next prime (18240577).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18240553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18240253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38826 + ... + 39292.

It is an arithmetic number, because the mean of its divisors is an integer number (2309580).

Almost surely, 2^18240553 is an apocalyptic number.

It is an amenable number.

18240553 is a deficient number, since it is larger than the sum of its proper divisors (236087).

18240553 is a wasteful number, since it uses less digits than its factorization.

18240553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 18240553 is about 4270.8960418160. The cubic root of 18240553 is about 263.2364348218.

The spelling of 18240553 in words is "eighteen million, two hundred forty thousand, five hundred fifty-three".