18865340 has 24 divisors (see below), whose sum is σ = 42665280. Its totient is φ = 6965568.

The previous prime is 18865331. The next prime is 18865351. The reversal of 18865340 is 4356881.

It is a self number, because there is not a number n which added to its sum of digits gives 18865340.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36020 + ... + 36539.

It is an arithmetic number, because the mean of its divisors is an integer number (1777720).

Almost surely, 2^18865340 is an apocalyptic number.

18865340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18865340 is an abundant number, since it is smaller than the sum of its proper divisors (23799940).

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

18865340 is a wasteful number, since it uses less digits than its factorization.

18865340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72581 (or 72579 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 18865340 is about 4343.4249158930. The cubic root of 18865340 is about 266.2082715063.

The spelling of 18865340 in words is "eighteen million, eight hundred sixty-five thousand, three hundred forty".