18379665 has 12 divisors (see below), whose sum is σ = 31858164. Its totient is φ = 9802464.

The previous prime is 18379663. The next prime is 18379681. The reversal of 18379665 is 56697381.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6765201 + 11614464 = 2601^2 + 3408^2 .

It is not a de Polignac number, because 18379665 - 2¹ = 18379663 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 408437 = 18379665 / (1 + 8 + 3 + 7 + 9 + 6 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 18379665.

It is not an unprimeable number, because it can be changed into a prime (18379661) 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 11 ways as a sum of consecutive naturals, for example, 204174 + ... + 204263.

It is an arithmetic number, because the mean of its divisors is an integer number (2654847).

Almost surely, 2^18379665 is an apocalyptic number.

18379665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18379665 is a deficient number, since it is larger than the sum of its proper divisors (13478499).

18379665 is a wasteful number, since it uses less digits than its factorization.

18379665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408448 (or 408445 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 18379665 is about 4287.1511519889. The cubic root of 18379665 is about 263.9039337108.

It can be divided in two parts, 18379 and 665, that added together give a square (19044 = 138²).

The spelling of 18379665 in words is "eighteen million, three hundred seventy-nine thousand, six hundred sixty-five".