18078730 has 16 divisors (see below), whose sum is σ = 33001344. Its totient is φ = 7129360.

The previous prime is 18078727. The next prime is 18078733. The reversal of 18078730 is 3787081.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18078727) and next prime (18078733).

It is not an unprimeable number, because it can be changed into a prime (18078733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12022 + ... + 13441.

It is an arithmetic number, because the mean of its divisors is an integer number (2062584).

Almost surely, 2^18078730 is an apocalyptic number.

18078730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18078730 is a deficient number, since it is larger than the sum of its proper divisors (14922614).

18078730 is a wasteful number, since it uses less digits than its factorization.

18078730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25541.

The product of its (nonzero) digits is 9408, while the sum is 34.

The square root of 18078730 is about 4251.9089830334. The cubic root of 18078730 is about 262.4556780800.

The spelling of 18078730 in words is "eighteen million, seventy-eight thousand, seven hundred thirty".