18815340 has 24 divisors (see below), whose sum is σ = 52683120. Its totient is φ = 5017408.

The previous prime is 18815333. The next prime is 18815347. The reversal of 18815340 is 4351881.

It is an interprime number because it is at equal distance from previous prime (18815333) and next prime (18815347).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 18815298 and 18815307.

It is not an unprimeable number, because it can be changed into a prime (18815347) 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 7 ways as a sum of consecutive naturals, for example, 156735 + ... + 156854.

It is an arithmetic number, because the mean of its divisors is an integer number (2195130).

Almost surely, 2^18815340 is an apocalyptic number.

18815340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18815340 is an abundant number, since it is smaller than the sum of its proper divisors (33867780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18815340 is a wasteful number, since it uses less digits than its factorization.

18815340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313601 (or 313599 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 18815340 is about 4337.6652706266. The cubic root of 18815340 is about 265.9728805714.

The spelling of 18815340 in words is "eighteen million, eight hundred fifteen thousand, three hundred forty".