18126780 has 48 divisors (see below), whose sum is σ = 58007040. Its totient is φ = 4143168.

The previous prime is 18126751. The next prime is 18126791. The reversal of 18126780 is 8762181.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 21160 + ... + 21999.

It is an arithmetic number, because the mean of its divisors is an integer number (1208480).

Almost surely, 2^18126780 is an apocalyptic number.

18126780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18126780 is an abundant number, since it is smaller than the sum of its proper divisors (39880260).

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

18126780 is a wasteful number, since it uses less digits than its factorization.

18126780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43178 (or 43176 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 18126780 is about 4257.5556367475. Note that the first 3 decimals coincide. The cubic root of 18126780 is about 262.6879923192.

The spelling of 18126780 in words is "eighteen million, one hundred twenty-six thousand, seven hundred eighty".