18380851 has 4 divisors (see below), whose sum is σ = 18613600. Its totient is φ = 18148104.

The previous prime is 18380849. The next prime is 18380881. The reversal of 18380851 is 15808381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15808381 = 97 ⋅162973.

It is a cyclic number.

It is not a de Polignac number, because 18380851 - 2¹ = 18380849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18380881) 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 3 ways as a sum of consecutive naturals, for example, 116256 + ... + 116413.

It is an arithmetic number, because the mean of its divisors is an integer number (4653400).

Almost surely, 2^18380851 is an apocalyptic number.

18380851 is a deficient number, since it is larger than the sum of its proper divisors (232749).

18380851 is an equidigital number, since it uses as much as digits as its factorization.

18380851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232748.

The product of its (nonzero) digits is 7680, while the sum is 34.

The square root of 18380851 is about 4287.2894700498. The cubic root of 18380851 is about 263.9096099720.

The spelling of 18380851 in words is "eighteen million, three hundred eighty thousand, eight hundred fifty-one".