18439968 has 48 divisors (see below), whose sum is σ = 51256800. Its totient is φ = 5784576.

The previous prime is 18439963. The next prime is 18439979. The reversal of 18439968 is 86993481.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (18439961) 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 7 ways as a sum of consecutive naturals, for example, 4018 + ... + 7281.

It is an arithmetic number, because the mean of its divisors is an integer number (1067850).

Almost surely, 2^18439968 is an apocalyptic number.

It is an amenable number.

18439968 is an abundant number, since it is smaller than the sum of its proper divisors (32816832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18439968 is a wasteful number, since it uses less digits than its factorization.

18439968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11329 (or 11321 counting only the distinct ones).

The product of its digits is 373248, while the sum is 48.

The square root of 18439968 is about 4294.1783847437. The cubic root of 18439968 is about 264.1922383116.

It can be divided in two parts, 1843 and 9968, that added together give a palindrome (11811).

The spelling of 18439968 in words is "eighteen million, four hundred thirty-nine thousand, nine hundred sixty-eight".