18730840 has 16 divisors (see below), whose sum is σ = 42144480. Its totient is φ = 7492320.

The previous prime is 18730837. The next prime is 18730841. The reversal of 18730840 is 4803781.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18730841) 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, 234096 + ... + 234175.

It is an arithmetic number, because the mean of its divisors is an integer number (2634030).

Almost surely, 2^18730840 is an apocalyptic number.

18730840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18730840 is an abundant number, since it is smaller than the sum of its proper divisors (23413640).

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

18730840 is a wasteful number, since it uses less digits than its factorization.

18730840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468282 (or 468278 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 18730840 is about 4327.9140472057. The cubic root of 18730840 is about 265.5741201740.

The spelling of 18730840 in words is "eighteen million, seven hundred thirty thousand, eight hundred forty".