18439379 has 8 divisors (see below), whose sum is σ = 21127008. Its totient is φ = 15765120.

The previous prime is 18439361. The next prime is 18439403. The reversal of 18439379 is 97393481.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18439379 - 2¹² = 18435283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18439319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182 + ... + 6075.

It is an arithmetic number, because the mean of its divisors is an integer number (2640876).

Almost surely, 2^18439379 is an apocalyptic number.

18439379 is a deficient number, since it is larger than the sum of its proper divisors (2687629).

18439379 is an equidigital number, since it uses as much as digits as its factorization.

18439379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6685.

The product of its digits is 163296, while the sum is 44.

The square root of 18439379 is about 4294.1098029743. The cubic root of 18439379 is about 264.1894253839.

The spelling of 18439379 in words is "eighteen million, four hundred thirty-nine thousand, three hundred seventy-nine".