18420375 has 16 divisors (see below), whose sum is σ = 30652128. Its totient is φ = 9824000.

The previous prime is 18420373. The next prime is 18420379. The reversal of 18420375 is 57302481.

It is not a de Polignac number, because 18420375 - 2¹ = 18420373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18420373) 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 15 ways as a sum of consecutive naturals, for example, 24186 + ... + 24935.

It is an arithmetic number, because the mean of its divisors is an integer number (1915758).

Almost surely, 2^18420375 is an apocalyptic number.

18420375 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18420375 is a deficient number, since it is larger than the sum of its proper divisors (12231753).

18420375 is an equidigital number, since it uses as much as digits as its factorization.

18420375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49139 (or 49129 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 18420375 is about 4291.8964339788. The cubic root of 18420375 is about 264.0986345168.

The spelling of 18420375 in words is "eighteen million, four hundred twenty thousand, three hundred seventy-five".