18142730 has 16 divisors (see below), whose sum is σ = 32749920. Its totient is φ = 7236432.

The previous prime is 18142717. The next prime is 18142753. The reversal of 18142730 is 3724181.

It is a self number, because there is not a number n which added to its sum of digits gives 18142730.

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, 1397 + ... + 6183.

It is an arithmetic number, because the mean of its divisors is an integer number (2046870).

Almost surely, 2^18142730 is an apocalyptic number.

18142730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18142730 is a deficient number, since it is larger than the sum of its proper divisors (14607190).

18142730 is a wasteful number, since it uses less digits than its factorization.

18142730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5173.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 18142730 is about 4259.4283654030. The cubic root of 18142730 is about 262.7650173096.

The spelling of 18142730 in words is "eighteen million, one hundred forty-two thousand, seven hundred thirty".