18340531 has 4 divisors (see below), whose sum is σ = 20007864. Its totient is φ = 16673200.

The previous prime is 18340523. The next prime is 18340547. The reversal of 18340531 is 13504381.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18340531 - 2³ = 18340523 is a prime.

It is a super-3 number, since 3×18340531³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18340496 and 18340505.

It is not an unprimeable number, because it can be changed into a prime (18340631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 833650 + ... + 833671.

It is an arithmetic number, because the mean of its divisors is an integer number (5001966).

Almost surely, 2^18340531 is an apocalyptic number.

18340531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18340531 is a deficient number, since it is larger than the sum of its proper divisors (1667333).

18340531 is a wasteful number, since it uses less digits than its factorization.

18340531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1667332.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 18340531 is about 4282.5846167939. The cubic root of 18340531 is about 263.7164991179.

The spelling of 18340531 in words is "eighteen million, three hundred forty thousand, five hundred thirty-one".